question_id stringlengths 8 35 | subject stringclasses 3
values | chapter stringclasses 90
values | topic stringclasses 459
values | question stringlengths 17 24.5k | options stringlengths 2 4.26k | correct_option stringclasses 6
values | answer stringclasses 460
values | explanation stringlengths 1 10.6k | question_type stringclasses 3
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|---|---|---|---|---|---|---|---|---|---|---|---|
pTx77IPXCWk30MCL097k9k2k5dztcnq | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | Given that the standard potentials (E<sup>o</sup>) of Cu<sup>2+</sup>/Cu and Cu<sup>+</sup>/Cu are 0.34 V and 0.522 V respectively, the E<sup>o</sup> of Cu<sup>2+</sup>/Cu<sup>+</sup> :
| [{"identifier": "A", "content": "- 0.182 V"}, {"identifier": "B", "content": "- 0.158 V"}, {"identifier": "C", "content": "0.182 V"}, {"identifier": "D", "content": "+0.158 V"}] | ["D"] | null | Cu<sup>+2</sup> + 2e<sup>–</sup> $$ \to $$ Cu E<sup>o</sup> = 0.34 V ....(1)
<br><br>Cu<sup>+</sup> + e<sup>–</sup> $$ \to $$Cu E<sup>o</sup> = 0.522 V
<br><br>Cu $$ \to $$ Cu<sup>+</sup> + e<sup>–</sup> E<sup>o</sup> = -0.522 V ...(2)
<br><br>By adding (1) and (2)... | mcq | jee-main-2020-online-7th-january-morning-slot | 2,079 |
xyPs8aYT7ryGrF9KBW1klrd7vdi | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | The electrode potential of M<sup>2+</sup>/M of 3d-series elements shows positive value for : | [{"identifier": "A", "content": "Zn"}, {"identifier": "B", "content": "Fe"}, {"identifier": "C", "content": "Cu"}, {"identifier": "D", "content": "Co"}] | ["C"] | null | In the electrode potential series, only copper have positive value for electrode potential because copper has lower tendency than hydrogen to form ions. So, if standard hydrogen electrode (E<sub>Cell</sub> = 0) is connected to copper half-cell, the copper with be relatively less negative or less number of electrons.<br... | mcq | jee-main-2021-online-24th-february-morning-slot | 2,080 |
SeyViQZTJBczrukccA1klrvokvj | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | The magnitude of the change in oxidising power of the $$MnO_4^ - /M{n^{2 + }}$$ couple is x $$\times$$ 10<sup>$$-$$4</sup> V, if the H<sup>+</sup> concentration is decreased from 1M to 10<sup>$$-$$4</sup> M at 25$$^\circ$$C. (Assume concentration of $$MnO_4^ - $$ and $$M{n^{2 + }}$$ to be same on change in H<sup>+</sup... | [] | null | 3776 | Reaction,<br/><br/>$$MnO_4^ - + {H^ + } + 5{e^ - } \to M{n^{2 + }} + 4{H_2}O$$<br/><br/>n = 5<br/><br/>Applying Nernst equation, $${E_{cell}} = E_{cell}^o - {{0.0591} \over n}\log {{[P]} \over {[R]}}$$<br/><br/>or $${E_{cell}} = E_{cell}^o - {{0.0591} \over n}\log {{[M{n^{2 + }}]} \over {[MnO_4^ - ]}}{\left[ {{1 \over... | integer | jee-main-2021-online-24th-february-evening-slot | 2,081 |
4Yp2aMGpnvNPL0Uy6O1kltc47br | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | Copper reduces NO$$_3^ - $$ into NO and NO<sub>2</sub> depending upon the concentration of HNO<sub>3</sub> in solution. (Assuming fixed [Cu<sup>2+</sup>] and P<sub>NO</sub> = P<sub>NO</sub><sub><sub>2</sub></sub>), the HNO<sub>3</sub> concentration at which the thermodynamic tendency for reduction of NO$$_3^ - $$ into ... | [] | null | 1 | <p>Cell-I $$(HN{O_3} \to NO)$$</p>
<p>$$3Cu + 2NO_3^ - + 8{H^ + } \to 3C{u^{2 + }} + 2NO + 4{H_2}O$$</p>
<p>$${Q_1} = {{{{[C{u^{2 + }}]}^3} \times {{({p_{NO}})}^2}} \over {{{[NO_3^ - ]}^2} \times {{[{H^ + }]}^8}}}$$</p>
<p>$$\because$$ $$E_1^o = 0.96 - ( - 0.34) = 1.3\,V$$</p>
<p>$${E_1} = 1.3 - {{0.059} \over 6}\log ... | integer | jee-main-2021-online-25th-february-evening-slot | 2,082 |
jLG6W2PJ5UxFcxWfm91klut0uwr | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | Emf of the following cell at 298K in V is x $$\times$$ 10<sup>$$-$$2</sup>.<br/><br/>Zn|Zn<sup>2+</sup>(0.1 M)||Ag<sup>+</sup> (0.01 M)|Ag<br/><br/>The value of x is _________. (Rounded off to the nearest integer)<br/><br/>[Given : $$E_{Z{n^{2 + }}/Zn}^\theta = - 0.76V;E_{A{g^{2 + }}/Ag}^\theta = + 0.80V;{{2.303RT}... | [] | null | 147 | Zn | Zn<sup>2+</sup>(0.1 M) || Ag<sup>+</sup> (0.01 M) | Ag
<br><br>Zn(s) + 2Ag<sup>+</sup> $$ \rightleftharpoons $$ 2Ag(s) + Zn<sup>+2</sup>
<br><br>$$E_{cell}^0 = E_{A{g^ + }/Ag}^0 - E_{Z{n^{2 + }}/Zn}^0$$<br><br>$$ = 0.80 - ( - 0.76)$$<br><br>$$ = 1.56V$$<br><br>$${E_{cell}} = 1.56 - {{ 0.059} \over 2}\log {{[Z{n^{2... | integer | jee-main-2021-online-26th-february-evening-slot | 2,083 |
osVjcTfBL1w3X6ksUK1kmlo5u32 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | For the reaction <br/><br/>2Fe<sup>3+</sup>(aq) + 2I<sup>$$-$$</sup>(aq) $$ \to $$ 2Fe<sup>2+</sup>(aq) + I<sub>2</sub>(s) <br/><br/>the magnitude of the standard molar Gibbs free energy change, $$\Delta$$<sub>r</sub>G$$_m^o$$ = $$-$$ ___________ kJ (Round off to the Nearest Integer).<br/><br/>$$\left[ {\matrix{
{E_... | [] | null | 46 | $$E_{F{e^{3 + }}/Fe}^o = 0.036V$$<br><br>$$F{e^{3 + }} + 3{e^ - } \to Fe$$<br><br>$$ \therefore $$ $$\Delta G_1^o = - nF{E^o}$$<br><br>$$ = - 3F( - 0.036)$$<br><br>$$E_{F{e^{2 + }}/Fe}^o = 0.440V$$<br><br>$$F{e^{2 + }} + 2{e^ - } \to Fe;{E^o} = - 0.440V$$<br><br>$$Fe \to F{e^{2 + }} + 2{e^ - };{E^o} = 0.440V$$<br><b... | integer | jee-main-2021-online-18th-march-morning-shift | 2,084 |
suxD30WLn7dxeUcHJv1kmm1zwv1 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm<sup>2</sup> mol<sup>$$-$$1</sup> respectively. The molar conductivity at infinite dilution of barium sulphate is _________ S cm<sup>2</sup> mol<sup>$$-$$1</sup>. (Round off to the Nearest Int... | [] | null | 288 | From Kohlrausch's law<br><br>$$\Lambda _m^\infty (BaS{O_4}) = \lambda _m^\infty (B{a^{2 + }}) + \lambda _m^\infty (SO_4^{2 - })$$<br><br>$$\Lambda _m^\infty (BaS{O_4}) = \Lambda _m^\infty (BaC{l_2}) + \Lambda _m^\infty ({H_2}S{O_4}) - 2\Lambda _m^\infty (HCl)$$<br><br>$$ = 280 + 860 - 2(426)$$<br><br>$$ = 288$$ S cm<su... | integer | jee-main-2021-online-18th-march-evening-shift | 2,085 |
1krt6rbxc | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | Assume a cell with the following reaction<br/><br/>$$C{u_{(s)}} + 2A{g^ + }(1 \times {10^{ - 3}}M) \to C{u^{2 + }}(0.250M) + 2A{g_{(s)}}$$<br/><br/>$$E_{cell}^\Theta = 2.97$$ V<br/><br/>E<sub>cell</sub> for the above reaction is ______________ V. (Nearest integer)<br/><br/>[Given : log 2.5 = 0.3979, T = 298 K] | [] | null | 3 | $$E = {E^o} - {{0.059} \over 2}\log {{[C{u^{ + 2}}]} \over {{{[A{g^ + }]}^2}}}$$<br><br>$$ = 2.97 - {{0.059} \over 2}\log {{0.25} \over {{{({{10}^{ - 3}})}^2}}} = 2.81V$$ | integer | jee-main-2021-online-22th-july-evening-shift | 2,086 |
1kruu8iyy | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | Consider the cell at 25$$^\circ$$C<br/><br/>Zn | Zn<sup>2+</sup> (aq), (1M) || Fe<sup>3+</sup> (aq), Fe<sup>2+</sup> (aq) | Pt(s)<br/><br/>The fraction of total iron present as Fe<sup>3+</sup> ion at the cell potential of 1.500 V is x $$\times$$ 10<sup>$$-$$2</sup>. The value of x is ______________. (Nearest integer)<b... | [] | null | 24 | $$Zn\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{}} Z{n^{2 + }} + 2{e^ - }$$<br><br>$$2F{e^{3 + }}\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{}} 2{e^ - } + 2{e^{2 + }}$$<br><br>$$Zn + 2F{e^{3 + }}\buildrel {} \over
\longrightarrow Z{n^{2 + }} + 2F{e^{2 + }}$$<br><br>$$E_{cell}^0 = 0.77 - (0.76)$$<br><br>$... | integer | jee-main-2021-online-25th-july-morning-shift | 2,087 |
1ks1kgm8f | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | For the cell<br/><br/>Cu(s) | Cu<sup>2+</sup> (aq) (0.1 M) || Ag<sup>+</sup>(aq) (0.01 M) | Ag(s)<br/><br/>the cell potential E<sub>1</sub> = 0.3095 V<br/><br/>For the cell<br/><br/>Cu(s) | Cu<sup>2+</sup> (aq) (0.01 M) || Ag<sup>+</sup>(aq) (0.001 M) | Ag(s)<br/><br/>the cell potential = ____________ $$\times$$ 10<sup... | [] | null | 28 | Cell reaction is :<br><br>$$Cu(s) + 2A{g^ + }(aq) \to C{u^{2 + }}(aq) + 2Ag(s)$$<br><br>Now, $${E_{cell}} = E_{cell}^o - {{0.059} \over 2}\log {{[C{u^{2 + }}]} \over {{{[A{g^ + }]}^2}}}$$ .... (1)<br><br>$$\therefore$$ $${E_1} = 0.3095 = E_{cell}^o - {{0.059} \over 2}.\log {{0.01} \over {{{(0.001)}^2}}}$$ ....(2)<br><b... | integer | jee-main-2021-online-27th-july-evening-shift | 2,088 |
1ktb5rkay | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | These are physical properties of an element<br/><br/>(A) Sublimation enthalpy<br/><br/>(B) Ionisation enthalpy<br/><br/>(C) Hydration enthalpy<br/><br/>(D) Electron gain enthalpy<br/><br/>The total number of above properties that affect the reduction potential is ____________ (Integer answer) | [] | null | 3 | Sublimation enthalpy, Ionisation enthalpy and hydration enthalpy affect the reduction potential. | integer | jee-main-2021-online-26th-august-morning-shift | 2,089 |
1ktifeqeb | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | Consider the following cell reaction :<br/><br/>$$C{d_{(s)}} + H{g_2}S{O_{4(s)}} + {9 \over 5}{H_2}{O_{(l)}}$$ $$\rightleftharpoons$$ $$CdS{O_4}.{9 \over 5}{H_2}{O_{(s)}} + 2H{g_{(l)}}$$<br/><br/>The value of $$E_{cell}^0$$ is 4.315 V at 25$$^\circ$$C. If $$\Delta$$H$$^\circ$$ = $$-$$825.2 kJ mol<sup>$$-$$1</sup>, the ... | [] | null | 25 | $$\Delta G^\circ = - nFE^\circ = \Delta H^\circ - T\Delta S^\circ $$<br><br>$$ \therefore $$ $$\Delta$$S$$^\circ$$ $$ = {{\Delta H^\circ + nFE^\circ } \over T}$$<br><br>$$ = {{( - 825.2 \times {{10}^3}) + (2 \times 96487 \times 4.315)} \over {298}}$$<br><br>$$ = {{ - 825.2 \times {{10}^3} + 832.682 \times {{10}^3}... | integer | jee-main-2021-online-31st-august-morning-shift | 2,091 |
1l54z9ki2 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The cell potential for the given cell at 298 K</p>
<p>Pt| H<sub>2</sub> (g, 1 bar) | H<sup>+</sup> (aq) || Cu<sup>2+</sup> (aq) | Cu(s)</p>
<p>is 0.31 V. The pH of the acidic solution is found to be 3, whereas the concentration of Cu<sup>2+</sup> is 10<sup>$$-$$x</sup> M. The value of x is ___________.</p>
<p>(Given... | [] | null | 7 | $\mathrm{Q}=\frac{\left[\mathrm{H}^{+}\right]^{2}}{\left[\mathrm{Cu}^{+2}\right] \mathrm{pH}_{2}}=\frac{10^{-6}}{\mathrm{C}} \quad \mathrm{pH}_{2}=1$
<br/><br/>
$$
\begin{aligned}
&E=E_{\text {cell }}^{\circ}-\frac{0.06}{n} \log Q \\\\
&0.31=0.34-\frac{0.06}{2} \log \frac{10^{-6}}{C} \\\\
&\log \frac{10^{-6}}{C}=1 \\\\... | integer | jee-main-2022-online-29th-june-evening-shift | 2,092 |
1l55o0q7g | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>For the given reactions</p>
<p>Sn<sup>2+</sup> + 2e<sup>$$-$$</sup> $$\to$$ Sn</p>
<p>Sn<sup>4+</sup> + 4e<sup>$$-$$</sup> $$\to$$ Sn</p>
<p>the electrode potentials are ; $$E_{S{n^{2 + }}/Sn}^o = - 0.140$$ V and $$E_{S{n^{4 + }}/Sn}^o = + 0.010$$ V. The magnitude of standard electrode potential for $$S{n^{4 + }}/... | [] | null | 16 | $\mathrm{Sn} \longrightarrow \mathrm{Sn}^{2+}+2 \mathrm{e}^{-} \quad \mathrm{E}_{1}^{0}=0.140 \mathrm{~V}$
<br/><br/>
$$
\mathrm{Sn}^{4+}+4 \mathrm{e}^{-} \longrightarrow \mathrm{Sn} \quad \mathrm{E}_{2}^{0}=0.010 \mathrm{~V}
$$
<br/><br/>
$$
\begin{aligned}
& \mathrm{Sn}^{4+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{S... | integer | jee-main-2022-online-28th-june-evening-shift | 2,093 |
1l56yxdpa | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>For the reaction taking place in the cell :</p>
<p>Pt (s)| H<sub>2</sub> (g)|H<sup>+</sup>(aq) || Ag<sup>+</sup>(aq) |Ag (s)</p>
<p>E$$_{cell}^o$$ = + 0.5332 V.</p>
<p>The value of $$\Delta$$<sub>f</sub>G$$^\circ$$ is ______________ kJ mol<sup>$$-$$1</sup>. (in nearest integer)</p> | [] | null | 51OR103 | <p><img src="https://app-content.cdn.examgoal.net/fly/@width/image/1l5dvv3ok/75b2d399-fc6d-47d7-872b-8dbd35bc2f5c/7f39f240-ff85-11ec-8a90-6db465c3d8db/file-1l5dvv3ol.png?format=png" data-orsrc="https://app-content.cdn.examgoal.net/image/1l5dvv3ok/75b2d399-fc6d-47d7-872b-8dbd35bc2f5c/7f39f240-ff85-11ec-8a90-6db465c3d8db... | integer | jee-main-2022-online-27th-june-evening-shift | 2,095 |
1l58dm2tw | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The $${\left( {{{\partial E} \over {\partial T}}} \right)_P}$$ of different types of half cells are as follows:</p>
<p><style type="text/css">
.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidde... | [{"identifier": "A", "content": "A"}, {"identifier": "B", "content": "B"}, {"identifier": "C", "content": "C"}, {"identifier": "D", "content": "D"}] | ["C"] | null | A cell with less variation in EMF with temperature
is preferred as a reference electrode because it can be
used for a wider range of temperatures without much
derivation from standard value so a cell with less $${\left( {{{\partial E} \over {\partial T}}} \right)_P}$$ is preferred. | mcq | jee-main-2022-online-26th-june-morning-shift | 2,096 |
1l59qx5vl | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The correct order of reduction potentials of the following pairs is</p>
<p>A. Cl<sub>2</sub>/Cl<sup>$$-$$</sup></p>
<p>B. I<sup>2</sup>/I<sup>$$-$$</sup></p>
<p>C. Ag<sup>+</sup>/Ag</p>
<p>D. Na<sup>+</sup>/Na</p>
<p>E. Li<sup>+</sup>/Li</p>
<p>Choose the correct answer from the options given below.</p> | [{"identifier": "A", "content": "A > C > B > D > E"}, {"identifier": "B", "content": "A > B > C > D > E"}, {"identifier": "C", "content": "A > C > B > E > D"}, {"identifier": "D", "content": "A > B > C > E > D"}] | ["A"] | null | $$\mathrm{E}_{\mathrm{C}_{2} / \mathrm{CI}}^{\circ}=+1.36 \mathrm{~V}$$<br/><br/>
$$\mathrm{E}_{\mathrm{I}_{2} / \mathrm{I}^{-}}^{0}=+0.54 \mathrm{~V}$$<br/><br/>
$$\mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\circ}=+0.80 \mathrm{~V}$$<br/><br/>
$$\mathrm{E}_{\mathrm{Na}^{+} / \mathrm{Na}}^{\circ}=-2.71 \mathrm{~V}$$<b... | mcq | jee-main-2022-online-25th-june-evening-shift | 2,098 |
1l5amp4h7 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>In a cell, the following reactions take place</p>
<p>$$\matrix{
{F{e^{2 + }} \to F{e^{3 + }} + {e^ - }} & {E_{F{e^{3 + }}/F{e^{2 + }}}^o = 0.77\,V} \cr
{2{I^ - } \to {I_2} + 2{e^ - }} & {E_{{I_2}/{I^ - }}^o = 0.54\,V} \cr
} $$</p>
<p>The standard electrode potential for the spontaneous reaction i... | [] | null | 23 | $\underset{\text { Cathode }}{\mathrm{Fe}^{+3}}+\underset{\text { anode }}{\mathrm{I}^{-}} \longrightarrow \mathrm{I}_2+\mathrm{Fe}^{+2}$<br/><br/>
$E_{\text {cell }}^{\circ}=E_{\text {cathode }}^{\circ}-E_{\text {anode }}^{\circ}$
<br/><br/>
$$
\begin{aligned}
&=0.77-0.54 \\\\
&=0.23 \mathrm{~V} \\\\
&=23 \times 10^{-... | integer | jee-main-2022-online-25th-june-morning-shift | 2,099 |
1l5c76kxu | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The cell potential for the following cell</p>
<p>Pt |H<sub>2</sub>(g)|H<sup>+</sup> (aq)|| Cu<sup>2+</sup> (0.01 M)|Cu(s)</p>
<p>is 0.576 V at 298 K. The pH of the solution is __________. (Nearest integer)</p>
<p>(Given : $$E_{C{u^{2 + }}/Cu}^o = 0.34$$ V and $${{2.303\,RT} \over F} = 0.06$$ V)</p> | [] | null | 5 | $E_{\text {cell }}=E_{\text {cell }}^{0}-\frac{0.06}{2} \log \frac{\left[\mathrm{H}^{\oplus}\right]^{2}}{\left[\mathrm{Cu}^{+2}\right]}$
<br/><br/>
$0.576=0.34-0.03 \log \frac{\left[\mathrm{H}^{\oplus}\right]^{2}}{[0.01]}$
<br/><br/>
$0.576-0.34=-0.03 \log \left[\mathrm{H}^{\oplus}\right]^{2}+0.03 \log (0.01)$
<br/><br... | integer | jee-main-2022-online-24th-june-morning-shift | 2,100 |
1l5w5nm6m | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>In which of the following half cells, electrochemical reaction is pH dependent?</p> | [{"identifier": "A", "content": "$$Pt\\,|\\,F{e^{3 + }},\\,F{e^{2 + }}$$"}, {"identifier": "B", "content": "$$MnO_4^ - \\,|M{n^{2 + }}$$"}, {"identifier": "C", "content": "$$Ag\\,|\\,AgCl\\,|C{l^{ - 1}}$$"}, {"identifier": "D", "content": "$${1 \\over 2}{F_2}\\,|{F^ - }$$"}] | ["B"] | null | Reduction of $\mathrm{MnO}_{4}^{-}$ is $\mathrm{pH}$ dependent.
<br/><br/>
In acidic medium
<br/><br/>
$$
\mathrm{MnO}_{4}^{-}+5 \mathrm{e}^{-} \longrightarrow \mathrm{Mn}^{2+}
$$
<br/><br/>
In neutral medium
<br/><br/>
$$
\mathrm{MnO}_{4}^{-}+3 \mathrm{e}^{-} \longrightarrow \mathrm{Mn}^{4+}
$$
<br/><br/>
In basic med... | mcq | jee-main-2022-online-30th-june-morning-shift | 2,101 |
1l6e2879n | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The cell potential for $$\mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq})\right|\left|\mathrm{Sn}^{x+}\right| \mathrm{Sn}$$ is $$0.801 \mathrm{~V}$$ at $$298 \mathrm{~K}$$. The reaction quotient for the above reaction is $$10^{-2}$$. The number of electrons involved in the given electrochemical cell reaction is ______... | [] | null | 4 | $$\mathrm{A}: \mathrm{Zn} \rightarrow \mathrm{Zn}^{2+}+2 e^{-}$$
<br/><br/>
$$\mathrm{C}: \mathrm{Sn}^{+\mathrm{x}}+\mathrm{xe}^{-} \rightarrow \mathrm{Sn}$$
<br/><br/>
$$\mathrm{E}_{\mathrm{Cell}}^{\circ}=\mathrm{E}_{\mathrm{Zn} \mid \mathrm{Zn}^{2+}}^{\circ}+\mathrm{E}_{\mathrm{Sn}^{+x} \mid \mathrm{Sn}}^{\circ}$$
<b... | integer | jee-main-2022-online-25th-july-morning-shift | 2,102 |
1l6f7wgww | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The spin-only magnetic moment value of M<sup>3+</sup> ion (in gaseous state) from the pairs Cr<sup>3+</sup> / Cr<sup>2+</sup>, Mn<sup>3+</sup> / Mn<sup>2+</sup>, Fe<sup>3+</sup> / Fe<sup>2+</sup> and Co<sup>3+</sup> / Co<sup>2+</sup> that has negative standard electrode potential, is ____________ B.M. [Nearest integ... | [] | null | 4 | Among the pairs given, $$\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}$$ has negative reduction potential which is $$-0.41 \mathrm{~V}$$.
<br/><br/>
$$\operatorname{Cr}$$ (III) $$\Rightarrow d^{3}$$
<br/><br/>
Number of unpaired electrons $$=3$$
<br/><br/>
$$\mu=\sqrt{3(3+2)}=\sqrt{15} \simeq 4$$ B.M. | integer | jee-main-2022-online-25th-july-evening-shift | 2,103 |
1l6rloh0k | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>For a cell, $$\mathrm{Cu}(\mathrm{s})\left|\mathrm{Cu}^{2+}(0.001 \,\mathrm{M}) \| \mathrm{Ag}^{+}(0.01 \,\mathrm{M})\right| \mathrm{Ag}(\mathrm{s})$$</p>
<p>the cell potential is found to be $$0.43 \mathrm{~V}$$ at $$298 \mathrm{~K}$$. The magnitude of standard electrode potential for $$\mathrm{Cu}^{2+} / \mathrm{C... | [] | null | 34 | Anode : $$\mathrm{Cu}(\mathrm{s}) \longrightarrow \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-}$$
<br/><br/>
Cathode : $$\left.[\mathrm{Ag}^{+}+\mathrm{e}^{-} \longrightarrow \mathrm{Ag}(\mathrm{s})\right] 2$$<br/><br/>
<hr/><br/>
Cus(s) $$+2 \mathrm{Ag}^{+}(\mathrm{aq}) \longrightarrow \mathrm{Cu}^{2+}(\mathrm{aq})+2... | integer | jee-main-2022-online-29th-july-evening-shift | 2,104 |
1ldol5t5t | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>At what pH, given half cell $$\mathrm{MnO_{4}^{-}(0.1~M)~|~Mn^{2+}(0.001~M)}$$ will have electrode potential of 1.282 V? ___________ (Nearest Integer)</p>
<p>Given $$\mathrm{E_{MnO_4^ - |M{n^{2 + }}}^o}=1.54~\mathrm{V},\frac{2.303\mathrm{RT}}{\mathrm{F}}=0.059\mathrm{V}$$</p> | [] | null | 3 | $\mathrm{MnO}_4^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightleftharpoons \mathrm{Mn}^{2+}+4 \mathrm{H}_2 \mathrm{O}$
<br/><br/>$$
\begin{aligned}
& \mathrm{E}=\mathrm{E}^{\circ}-\frac{0.059}{5} \log \frac{\left[\mathrm{Mn}^{2+}\right]}{\left[\mathrm{MnO}_4^{-}\right]\left[\mathrm{H}^{+}\right]^8} \\\\
& \Rightarrow 1.2... | integer | jee-main-2023-online-1st-february-morning-shift | 2,105 |
1ldppqhxp | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The logarithm of equilibrium constant for the reaction $$\mathrm{Pd}^{2+}+4 \mathrm{Cl}^{-} \rightleftharpoons \mathrm{PdCl}_{4}^{2-}$$ is ___________ (Nearest integer)</p>
<p>Given : $$\frac{2.303 R \mathrm{~T}}{\mathrm{~F}}=0.06 \mathrm{~V}$$</p>
<p>$$
\mathrm{Pd}_{(\mathrm{aq})}^{2+}+2 \mathrm{e}^{-} \rightleftha... | [] | null | 6 | Sol. $\Delta G^{\circ}=-R T \ell n K$
<br/><br/>$$
\begin{aligned}
& -\mathrm{nFE}_{\text {cell }}^{\mathrm{o}}=-\mathrm{RT} \times 2.303\left(\log _{10} \mathrm{~K}\right) \\\\
& \frac{\mathrm{E}_{\text {Cell }}^{\mathrm{o}}}{0.06} \times \mathrm{n}=\log \mathrm{K} .......(1) \\\\
& \mathrm{Pd}^{+2} \text { (aq.) }+ \... | integer | jee-main-2023-online-31st-january-morning-shift | 2,106 |
ldqy2wja | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | The electrode potential of the following half cell at $298 \mathrm{~K}$
<br/><br/>
$\mathrm{X}\left|\mathrm{X}^{2+}(0.001 \mathrm{M}) \| \mathrm{Y}^{2+}(0.01 \mathrm{M})\right| \mathrm{Y}$ is _______ $\times 10^{-2} \mathrm{~V}$ (Nearest integer)
<br/><br/>
Given: $\mathrm{E}^{0} _ {\mathrm{X}^{2+} \mid \mathrm{X}}=-2.... | [] | null | 275 | $$
\begin{aligned}
& \text { Cell reaction : } X+Y^{2+}(0.01 \mathrm{M}) \longrightarrow X^{2+}(0.001 \mathrm{M})+Y \\\\
& E_{\text {cell }}^o=0.36-(-2.36)=2.72 \mathrm{~V} \\\\
& E_{\text {cell }}=E_{\text {cell }}^{\circ}-\frac{2.303 R T}{n F} \log \frac{\left[X^{2+}\right]}{\left[Y^{2+}\right]} \\\\
& =2.72-\frac{0.... | integer | jee-main-2023-online-30th-january-evening-shift | 2,107 |
1ldssd0qo | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The standard electrode potential $$\mathrm{(M^{3+}/M^{2+})}$$ for V, Cr, Mn & Co are $$-$$0.26 V, $$-$$0.41 V, + 1.57 V and + 1.97 V, respectively. The metal ions which can liberate $$\mathrm{H_2}$$ from a dilute acid are :</p> | [{"identifier": "A", "content": "$$\\mathrm{Mn^{2+}}$$ and $$\\mathrm{Co^{2+}}$$"}, {"identifier": "B", "content": "$$\\mathrm{V^{2+}}$$ and $$\\mathrm{Mn^{2+}}$$"}, {"identifier": "C", "content": "$$\\mathrm{V^{2+}}$$ and $$\\mathrm{Cr^{2+}}$$"}, {"identifier": "D", "content": "$$\\mathrm{Cr^{2+}}$$ and $$\\mathrm{Co^... | ["C"] | null | Metal cation with $(-)$ value of reduction potential $\left(\mathrm{M}^{+3} / \mathrm{M}^{+2}\right)$ or with $(+)$ value of oxidation potential $\left(\mathrm{M}^{+2} / \mathrm{M}^{+3}\right)$ will liberate $\mathrm{H}_{2}$<br/><br/> Therefore they will reduce $\mathrm{H}^{+}$ i. $\mathrm{e~V}^{+2}$ and $\mathrm{Cr}^{... | mcq | jee-main-2023-online-29th-january-morning-shift | 2,110 |
1ldu3s4lv | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>$$Pt(s)|{H_2}(g)(1\,bar)|{H^ + }(aq)(1\,M)||{M^{3 + }}(aq),{M^ + }(aq)|Pt(s)$$</p>
<p>The $$\mathrm{E_{cell}}$$ for the given cell is 0.1115 V at 298 K when $${{\left[ {{M^ + }(aq)} \right]} \over {\left[ {{M^{3 + }}(aq)} \right]}} = {10^a}$$</p>
<p>The value of $$a$$ is ____________</p>
<p>Given : $$\mathrm{E_{{M^{... | [] | null | 3 | Overall reaction :-<br/><br/>
$$
\begin{aligned}
& \mathrm{H}_{2(\mathrm{~g})}+\mathrm{M}_{(\mathrm{aq})}^{3+} \longrightarrow \mathrm{M}_{\text {(aq) }}^{+}+2 \mathrm{H}_{(\mathrm{aq})}^{+} \\\\
& \mathrm{E}_{\text {Cell }}=\mathrm{E}_{\text {Cathode }}^{\mathrm{o}}-\mathrm{E}_{\text {anode }}^{\mathrm{o}}-\frac{0.059... | integer | jee-main-2023-online-25th-january-evening-shift | 2,111 |
1ldyhu8bj | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>At 298 K, a 1 litre solution containing 10 mmol of $$\mathrm{C{r_2}O_7^{2 - }}$$ and 100 mmol of $$\mathrm{Cr^{3+}}$$ shows a pH of 3.0.</p>
<p>Given : $$\mathrm{C{r_2}O_7^{2 - } \to C{r^{3 + }}\,;\,E^\circ = 1.330}$$V</p>
<p>and $$\mathrm{{{2.303\,RT} \over F} = 0.059}$$ V</p>
<p>The potential for the half cell re... | [] | null | 917 | $$
\begin{aligned}
& \mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O} \\\\
& \mathrm{E}=1.33-\frac{0.059}{6} \log \frac{(0.1)^2}{\left(10^{-2}\right)\left(10^{-3}\right)^{14}} \\\\
& \mathrm{E}=1.33-\frac{0.059}{6} \times 42=0.917 \\\\
& \mathrm... | integer | jee-main-2023-online-24th-january-morning-shift | 2,113 |
1lgp3qrp1 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>At $$298 \mathrm{~K}$$, the standard reduction potential for $$\mathrm{Cu}^{2+} / \mathrm{Cu}$$ electrode is $$0.34 \mathrm{~V}$$.</p>
<p>Given : $$\mathrm{K}_{\mathrm{sp}} \mathrm{Cu}(\mathrm{OH})_{2}=1 \times 10^{-20}$$</p>
<p>Take $$\frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059 \mathrm{~V}$$</p>
<p>The reduction pot... | [] | null | 25 | Given:
<br/><br/>
Standard reduction potential for Cu²⁺/Cu, E° = 0.34 V<br/><br/>
Ksp of Cu(OH)₂ = 1 × 10⁻²⁰<br/><br/>
2.303RT/F = 0.059 V<br/><br/>
pH = 14
<br/><br/>
First, we have the solubility equilibrium for Cu(OH)₂:
<br/><br/>
$$\mathrm{Cu}(\mathrm{OH})_2(\mathrm{~s}) \rightleftharpoons \mathrm{Cu}^{2+}(\mathrm{... | integer | jee-main-2023-online-13th-april-evening-shift | 2,114 |
1lgszc3wc | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The number of correct statements from the following is __________</p>
<p>A. $$\mathrm{E_{\text {cell }}}$$ is an intensive parameter</p>
<p>B. A negative $$\mathrm{E}^{\ominus}$$ means that the redox couple is a stronger reducing agent than the $$\mathrm{H}^{+} / \mathrm{H}_{2}$$ couple.</p>
<p>C. The amount of elec... | [] | null | 4 | <p>A. $$\mathrm{E_{\text {cell }}}$$ is an intensive parameter. </p>
<p>This statement is correct. The standard cell potential ($$\mathrm{E}^{\ominus}_{\text{cell}}$$) is an intensive parameter because it depends only on the nature of the reactants and the products, and not on the size or shape of the electrodes or the... | integer | jee-main-2023-online-11th-april-evening-shift | 2,115 |
1lgv14ys1 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>In an electrochemical reaction of lead, at standard temperature, if $$\mathrm{E}^{0}\left(\mathrm{~Pb}^{2+} / \mathrm{Pb}\right)=\mathrm{m}$$ Volt and $$\mathrm{E}^{0}\left(\mathrm{~Pb}^{4+} / \mathrm{Pb}\right)=\mathrm{n}$$ Volt, then the value of $$\mathrm{E}^{0}\left(\mathrm{~Pb}^{2+} / \mathrm{Pb}^{4+}\right)$$ ... | [] | null | 2 | In this problem, we're considering three different half-cell reactions involving lead ions.
<br/><br/>1) The reduction of $$\mathrm{Pb}^{2+}$$ ions to lead metal :
<br/><br/>$$\mathrm{Pb}^{2+} + 2 \mathrm{e}^{-} \rightarrow \mathrm{Pb}$$
<br/><br/>The Gibbs free energy change for this process can be written as $$\Delt... | integer | jee-main-2023-online-11th-april-morning-shift | 2,116 |
1lgyt87c0 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The number of incorrect statements from the following is ___________.</p>
<p>A. The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy.</p>
<p>B. $$\mathrm{E_{cell}^{\circ}}$$ cell is dependent on the pressure.</p>
<p>C. $$\frac{d E^{\theta} \text {... | [] | null | 1 | <p>Let's go through the statements one by one:</p>
<p>A. The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy. </p>
<p>This statement is <strong>correct</strong>. The maximum non-expansion work that a system can perform at constant temperature an... | integer | jee-main-2023-online-8th-april-evening-shift | 2,118 |
1lh03dlfs | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The reaction</p>
<p>$$\frac{1}{2} \mathrm{H}_{2}(\mathrm{~g})+\mathrm{AgCl}(\mathrm{s}) \rightleftharpoons \mathrm{H}^{+}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq})+\mathrm{Ag}(\mathrm{s})$$</p>
<p>occurs in which of the given galvanic cell.</p> | [{"identifier": "A", "content": "$$\\mathrm{Ag}|\\mathrm{AgCl}(\\mathrm{s})| \\mathrm{KCl}\\left(\\mathrm{sol}^{\\mathrm{n}}\\right)\\left|\\mathrm{AgNO}_{3}\\right| \\mathrm{Ag}$$"}, {"identifier": "B", "content": "$$\\mathrm{Pt}\\left|\\mathrm{H}_{2}(\\mathrm{~g})\\right| \\mathrm{HCl}\\left(\\mathrm{sol}^{\\mathrm{n... | ["B"] | null | <p>The provided reaction is:</p>
<p>$$\frac{1}{2} \mathrm{H}_{2}(\mathrm{~g})+\mathrm{AgCl}(\mathrm{s}) \rightleftharpoons \mathrm{H}^{+}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq})+\mathrm{Ag}(\mathrm{s})$$</p>
<p>This reaction involves the following half-reactions:</p>
<ol>
<li>Oxidation of hydrogen gas to H+ ions: $$\... | mcq | jee-main-2023-online-8th-april-morning-shift | 2,119 |
1lh27hyo5 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The standard electrode potential of $$\mathrm{M}^{+} / \mathrm{M}$$ in aqueous solution does not depend on</p> | [{"identifier": "A", "content": "Ionisation of a gaseous metal atom"}, {"identifier": "B", "content": " Sublimation of a solid metal"}, {"identifier": "C", "content": "Ionisation of a solid metal atom"}, {"identifier": "D", "content": "Hydration of a gaseous metal ion"}] | ["C"] | null | <p>The standard electrode potential (E°) of a metal ion M<sup>+</sup>/M in aqueous solution is calculated under standard conditions and relates to the tendency of the M<sup>+</sup> ion to gain an electron to form the neutral metal atom, M. </p>
<p>This is indeed a redox (reduction-oxidation) process, and the standard e... | mcq | jee-main-2023-online-6th-april-morning-shift | 2,120 |
1lh32pvbe | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The standard reduction potentials at $$298 \mathrm{~K}$$ for the following half cells are given below:</p>
<p>$$\mathrm{NO}_{3}^{-}+4 \mathrm{H}^{+}+3 \mathrm{e}^{-} \rightarrow \mathrm{NO}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O} \quad \mathrm{E}^{\theta}=0.97 \mathrm{~V}$$</p>
<p>$$\mathrm{V}^{2+}(\mathrm{aq})+2 \m... | [] | null | 3 | <p>To determine the metals that can be oxidized by $NO_3^-$, we need to find the metals that have a standard reduction potential (SRP) lower than 0.97 V (since $NO_3^-$ has an SRP of 0.97 V).</p>
<p>From the given data, we can find the metals that satisfy this condition:</p>
<ol>
<li>$V^{2+} (\text{aq}) + 2e^- \rightar... | integer | jee-main-2023-online-6th-april-evening-shift | 2,121 |
lsape1rr | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | Consider the following redox reaction :<br/><br/>
$$
\mathrm{MnO}_4^{-}+\mathrm{H}^{+}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \rightleftharpoons \mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2
$$
<br/><br/>
The standard reduction potentials are given as below $\left(\mathrm{E}_{\text {red }}^0\right)$ :
<br/><br... | [] | null | 338 | Cell $\mathrm{Rx}^{\mathrm{n}} ; \mathrm{MnO}_4^{-}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \rightarrow \mathrm{Mn}^{2+}+\mathrm{CO}_2$
<br/><br/>$\mathrm{E}_{\text {cell }}^{\circ}=\mathrm{E}_{\text {op }}^{\circ}$ of anode $+\mathrm{E}_{\mathrm{RP}}^{\circ}$ of cathode
<br/><br/>$$
=0.49+1.51=2.00 \mathrm{~V}
$$
<br/... | integer | jee-main-2024-online-1st-february-evening-shift | 2,122 |
lsbmzp2l | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | The potential for the given half cell at $298 \mathrm{~K}$ is (-) __________ $\times 10^{-2} \mathrm{~V}$<br/><br/>
$$
\begin{aligned}
& 2 \mathrm{H}_{(\mathrm{aq})}^{+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_2(\mathrm{~g}) \\\\
& {\left[\mathrm{H}^{+}\right]=1 \mathrm{M}, \mathrm{P}_{\mathrm{H}_2}=2 \math... | [] | null | 1 | <p>To find the potential of the given half cell at 298 K, we can use the Nernst equation, which in this scenario is simplified due to the standard conditions for the hydrogen ion concentration ($[\mathrm{H}^{+}] = 1 M$). The half-reaction involved is the reduction of hydrogen ions to hydrogen gas:</p>
<p>$$2 \mathrm{H}... | integer | jee-main-2024-online-1st-february-morning-shift | 2,123 |
1lsg81ysc | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>Reduction potential of ions are given below:</p>
<p>$$\begin{array}{ccc}
\mathrm{ClO}_4^{-} & \mathrm{IO}_4^{-} & \mathrm{BrO}_4^{-} \\
\mathrm{E}^{\circ}=1.19 \mathrm{~V} & \mathrm{E}^{\circ}=1.65 \mathrm{~V} & \mathrm{E}^{\circ}=1.74 \mathrm{~V}
\end{array}$$</p>
<p>The correct order of their oxidi... | [{"identifier": "A", "content": "$$\\mathrm{IO}_4^{-}>\\mathrm{BrO}_4^{-}>\\mathrm{ClO}_4^{-}$$\n"}, {"identifier": "B", "content": "$$\\mathrm{BrO}_4^{-}>\\mathrm{ClO}_4^{-}>\\mathrm{IO}_4^{-}$$\n"}, {"identifier": "C", "content": "$$\\mathrm{ClO}_4^{-}>\\mathrm{IO}_4^{-}>\\mathrm{BrO}_4^{-}$$\n"}, {"identifier": "D",... | ["D"] | null | <p>Higher the value of $$\oplus$$ve SRP (Std. reduction potential) more is tendency to undergo reduction, so better is oxidising power of reactant.</p>
<p>Hence, ox. Power:- $$\mathrm{BrO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{ClO}_4^{-}$$</p> | mcq | jee-main-2024-online-30th-january-evening-shift | 2,125 |
luz2uu2r | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The standard reduction potentials at $$298 \mathrm{~K}$$ for the following half cells are given below :</p>
<p>$$\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O}, \quad \mathrm{E}^{\circ}=1.33 \mathrm{~V}$$</p>
<p>$$\begin{array}{ll}
\mathrm{... | [] | null | 3 | <p>To determine the number of metals that will be oxidized by $$\mathrm{Cr}_2\mathrm{O}_7^{2-}$$ in aqueous solution, we need to compare their standard reduction potentials with that of the given reduction potential of $$\mathrm{Cr}_2\mathrm{O}_7^{2-}$$.</p>
<p>The reduction reaction for $$\mathrm{Cr}_2\mathrm{O}_7^{2... | integer | jee-main-2024-online-9th-april-morning-shift | 2,126 |
lv0vyqtr | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?</p> | [{"identifier": "A", "content": "Metal ion - Metal electrodes\n"}, {"identifier": "B", "content": "Oxidation - Reduction electrodes\n"}, {"identifier": "C", "content": "Metal - Insoluble Salt - Anion electrodes\n"}, {"identifier": "D", "content": "Gas - Ion electrodes"}] | ["C"] | null | <p>Calomel electrode is metal-insoluble salt – Anion
electrode.</p> | mcq | jee-main-2024-online-4th-april-morning-shift | 2,127 |
lv0vyr3r | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>What pressure (bar) of $$\mathrm{H}_2$$ would be required to make emf of hydrogen electrode zero in pure water at $$25^{\circ} \mathrm{C}$$ ?</p> | [{"identifier": "A", "content": "0.5"}, {"identifier": "B", "content": "$$10^{-14}$$"}, {"identifier": "C", "content": "1"}, {"identifier": "D", "content": "$$10^{-7}$$"}] | ["B"] | null | <p>The electromotive force (emf) of a hydrogen electrode can be derived from the Nernst equation, which for the hydrogen half-cell reaction $$\mathrm{H_2(g)} \rightarrow 2\mathrm{H^+(aq)} + 2\mathrm{e^-}$$ is given by:</p>
<p>$$ E = E^\circ + \frac{RT}{2F} \ln \left( \frac{[\mathrm{H^+}]^2}{P_{\mathrm{H_2}}} \right) $... | mcq | jee-main-2024-online-4th-april-morning-shift | 2,128 |
lv3xmaj6 | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The emf of cell $$\mathrm{Tl}\left|\underset{(0.001 \mathrm{M})}{\mathrm{Tl}^{+}}\right| \underset{(0.01 \mathrm{M})}{\mathrm{Cu}^{2+}} \mid \mathrm{Cu}$$ is $$0.83 \mathrm{~V}$$ at $$298 \mathrm{~K}$$. It could be increased by :</p> | [{"identifier": "A", "content": "increasing concentration of $$\\mathrm{Tl}^{+}$$ ions\n"}, {"identifier": "B", "content": "increasing concentration of $$\\mathrm{Cu}^{2+}$$ ions\n"}, {"identifier": "C", "content": "increasing concentration of both $$\\mathrm{Tl}^{+}$$ and $$\\mathrm{Cu}^{2+}$$ ions\n"}, {"identifier":... | ["B"] | null | <p>To determine how the emf of the cell, $$\mathrm{Tl}\left|\underset{(0.001 \mathrm{M})}{\mathrm{Tl}^{+}}\right| \underset{(0.01 \mathrm{M})}{\mathrm{Cu}^{2+}} \mid \mathrm{Cu}$$, can be increased, we can use the Nernst equation. The Nernst equation for this electrochemical cell is given by:</p>
<p>$$ E_{\text{cell}}... | mcq | jee-main-2024-online-8th-april-evening-shift | 2,129 |
lv3xmape | chemistry | electrochemistry | electrochemical-series,-cell-and-their-emf | <p>The reaction;</p>
<p>$$\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})}+\mathrm{AgCl}_{(\mathrm{s})} \rightarrow \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Ag}_{(\mathrm{s})}$$</p>
<p>occurs in which of the following galvanic cell :</p> | [{"identifier": "A", "content": "$$\\mathrm{Pt}\\left|\\mathrm{H}_{2(\\mathrm{~g})}\\right| \\mathrm{HCl}_{(\\text {soln.) }}\\left|\\mathrm{AgNO}_{3(\\mathrm{aq})}\\right| \\mathrm{Ag}$$\n"}, {"identifier": "B", "content": "$$\\mathrm{Ag}\\left|\\mathrm{AgCl}_{(\\mathrm{s})}\\right| \\mathrm{KCl}_{\\text {(soln.) }}\\... | ["D"] | null | <p>To determine which galvanic cell corresponds to the given reaction:</p>
<p>$$\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})}+\mathrm{AgCl}_{(\mathrm{s})} \rightarrow \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Ag}_{(\mathrm{s})}$$</p>
<p>we need to examine the setups of the given cells and check... | mcq | jee-main-2024-online-8th-april-evening-shift | 2,130 |
DPHjNRp9HYMpCuwb | chemistry | environmental-chemistry | air-pollution | The smog is essentially caused by the presence of : | [{"identifier": "A", "content": "O<sub>2</sub> and O<sub>3</sub>c"}, {"identifier": "B", "content": "O<sub>3</sub> and N<sub>2</sub>"}, {"identifier": "C", "content": "Oxides of sulphur and nitrogen"}, {"identifier": "D", "content": "O<sub>2</sub> and N<sub>2</sub>"}] | ["C"] | null | Photochemical smog is caused by oxides of sulphur and nitrogen. | mcq | aieee-2004 | 2,133 |
QKEcqENtJnpSfcXvhegj4 | chemistry | environmental-chemistry | air-pollution | The higher concentration of which gas in air can cause stiffness of flower buds? | [{"identifier": "A", "content": "CO<sub>2</sub>"}, {"identifier": "B", "content": "SO<sub>2</sub>"}, {"identifier": "C", "content": "NO<sub>2</sub>"}, {"identifier": "D", "content": "CO"}] | ["B"] | null | Due to acid rain in plants high concentration of SO<sub>2</sub> makes the flower buds stiff and makes them
fall. | mcq | jee-main-2019-online-11th-january-evening-slot | 2,135 |
liHlouQwo3AJFRY2yHKo8 | chemistry | environmental-chemistry | air-pollution | The molecule that has minimum /no role in the formation of photochemical smog, is : | [{"identifier": "A", "content": "CH<sub>2</sub> = O"}, {"identifier": "B", "content": "O<sub>3</sub>"}, {"identifier": "C", "content": "N<sub>2</sub>"}, {"identifier": "D", "content": "NO "}] | ["C"] | null | Photochemical smog is produced when ultraviolet light from sun reacts with NO
, O<sub>3</sub>
and hydrocarbon in atmosphere. | mcq | jee-main-2019-online-12th-january-morning-slot | 2,137 |
FDGOEhX2Tizw3ovpN6Dc3 | chemistry | environmental-chemistry | air-pollution | The compound that is NOT a common component of photochemical smog is : | [{"identifier": "A", "content": "O<sub>3</sub>"}, {"identifier": "B", "content": "<img src=\"https://res.cloudinary.com/dckxllbjy/image/upload/v1734264279/exam_images/ogjctwrkb9zy3gxfbdyl.webp\" style=\"max-width: 100%; height: auto;display: block;margin: 0 auto;\" loading=\"lazy\" alt=\"JEE Main 2019 (Online) 12th Ja... | ["D"] | null | CF<sub>2</sub><sub></sub>Cl<sub>2</sub> or Cloro fluro Carbon is not a common component of photochemical smog. | mcq | jee-main-2019-online-12th-january-evening-slot | 2,138 |
CkxJwS2oCs8jm63Zy5fPu | chemistry | environmental-chemistry | air-pollution | Excessive release of CO<sub>2</sub> into the atomosphere
results in : | [{"identifier": "A", "content": "depletion of ozone"}, {"identifier": "B", "content": "polar vortex"}, {"identifier": "C", "content": "global warming"}, {"identifier": "D", "content": "formation of smog"}] | ["C"] | null | CO<sub>2</sub> causes global warming. | mcq | jee-main-2019-online-9th-april-morning-slot | 2,139 |
VaOZbTZwaxfCaaoPRD3rsa0w2w9jx4rhrq2 | chemistry | environmental-chemistry | air-pollution | The correct set of species responsible for the photochemical smog is : | [{"identifier": "A", "content": "NO, NO<sub>2</sub>, O<sub>3</sub> and hydrocarbons"}, {"identifier": "B", "content": "N<sub>2</sub>, NO<sub>2 </sub>and hydrocarbons"}, {"identifier": "C", "content": "CO<sub>2</sub>, NO<sub>2</sub>, SO<sub>2</sub> and hydrocarbons"}, {"identifier": "D", "content": "N<sub>2</sub>, O<sub... | ["A"] | null | Photochemical smog contains oxides of
nitrogen, ozone and hydrocarbons. | mcq | jee-main-2019-online-12th-april-morning-slot | 2,141 |
UvgCshfDcKHOwhQU5T3rsa0w2w9jx82y8m9 | chemistry | environmental-chemistry | air-pollution | The primary pollutant that leads to photochemical smog is : | [{"identifier": "A", "content": "acrolein"}, {"identifier": "B", "content": "ozone"}, {"identifier": "C", "content": "sulphur dioxide"}, {"identifier": "D", "content": "nitrogen oxides "}] | ["D"] | null | Photochemical smog contains oxides of nitrogen. | mcq | jee-main-2019-online-12th-april-evening-slot | 2,142 |
fp55glCcOI1w0uaeDPgFI | chemistry | environmental-chemistry | air-pollution | Peroxyacetyl nitrate (PAN), an eye irritant is produced by : | [{"identifier": "A", "content": "classical smog "}, {"identifier": "B", "content": "acid rain "}, {"identifier": "C", "content": "photochemical smog "}, {"identifier": "D", "content": "organic waste "}] | ["C"] | null | Photochemical smog produce chemicals such as formaldehyde, acrolein and peroxyacetyl nitrate(PAN). | mcq | jee-main-2019-online-11th-january-morning-slot | 2,143 |
QRHQxJBw8bwRj2HRehjgy2xukf2b9eyf | chemistry | environmental-chemistry | air-pollution | Thermal power plants can lead to : | [{"identifier": "A", "content": "Ozone layer depletion"}, {"identifier": "B", "content": "Blue baby syndrome"}, {"identifier": "C", "content": "Eutrophication"}, {"identifier": "D", "content": "Acid rain"}] | ["D"] | null | Thermal power plants lead to acid rain. | mcq | jee-main-2020-online-3rd-september-morning-slot | 2,144 |
Fbw4wlLdPmIA8b9Oxfjgy2xukf3imnr7 | chemistry | environmental-chemistry | air-pollution | The incorrect statement(s) among (a) – (d)
regarding acid rain is (are) :
<br/><br/>(a) It can corrode water pipes.
<br/>(b) It can damage structures made up of stone.
<br/>(c) It cannot cause respiratory ailments in animals.
<br/>(d) It is not harmful for trees | [{"identifier": "A", "content": "(c) and (d)"}, {"identifier": "B", "content": "(a), (b) and (d)"}, {"identifier": "C", "content": "(c) only"}, {"identifier": "D", "content": "(a), (c) and (d)"}] | ["A"] | null | (1) Acid rain corrodes water pipes resulting in the leaching of heavy of heavy metals such as iron, lead and
copper into the drinking water.
<br><br>(2) Acid rain damages buildings and other structures made of stone or metal.
<br><br>(3) It causes respiratory aliments in human beings and animals.
<br><br>(4) It is harm... | mcq | jee-main-2020-online-3rd-september-evening-slot | 2,145 |
6LNV19yErXPc3smIjjjgy2xukevl1i6a | chemistry | environmental-chemistry | air-pollution | The statement that is not true about ozone is : | [{"identifier": "A", "content": "In the stratosphere, CFCs release chlorine\nfree radicals (Cl) which reacts with O<sub>3</sub> to\ngive chlorine dioxide radicals"}, {"identifier": "B", "content": "It is a toxic gas and its reaction with NO\ngives NO<sub>2</sub>."}, {"identifier": "C", "content": "In the atmosphere, it... | ["A"] | null | In the stratosphere, CFCs release chlorine free radical ($$\mathop {Cl}\limits^ \bullet $$).
<br><br>CF<sub>2</sub>Cl<sub>2</sub>(g) $$\buildrel {UV} \over
\longrightarrow $$ $$\mathop {Cl}\limits^ \bullet $$(g) + $$\mathop {Cl}\limits^ \bullet $$F<sub>2</sub>Cl(g)
<br><br>Which react with O<sub>3</sub> to give chl... | mcq | jee-main-2020-online-2nd-september-morning-slot | 2,146 |
7NpjlPPfiMF7Sovh0x1kls8x5sw | chemistry | environmental-chemistry | air-pollution | Given below are two statements :<br/><br/>Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog.<br/><br/>Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog.<br/><br/>In the light of the above... | [{"identifier": "A", "content": "Statement I is false but Statement II is true"}, {"identifier": "B", "content": "Both Statement I and Statement II are false"}, {"identifier": "C", "content": "Both Statement I and Statement II are true"}, {"identifier": "D", "content": "Statement I is true but Statement II is false"}] | ["B"] | null | Reducing smog as is acts as reducing agent, the reducing character is due to presence of
sulphur dioxide and carbon particles. | mcq | jee-main-2021-online-25th-february-morning-slot | 2,147 |
r4Ioich78qXNzBWHRx1klucy0ej | chemistry | environmental-chemistry | air-pollution | The presence of ozone in troposphere : | [{"identifier": "A", "content": "protects us from greenhouse effect "}, {"identifier": "B", "content": "protects us from the UV radiation"}, {"identifier": "C", "content": "protects us from the X-ray radiation"}, {"identifier": "D", "content": "generates photochemical smog"}] | ["D"] | null | <p>Ozone is a strong oxidising agent like NO<sub>2</sub>. In troposphere both O<sub>3</sub> and NO<sub>2</sub> react with the unburnt hydrocarbons to produce the chemical components of photochemical smog, like formaldehyde (HCHO), acrolein (CH<sub>2</sub> = CH - CHO) and PAN or peroxyacetyl nitrate.</p>
<p> Hence, in t... | mcq | jee-main-2021-online-26th-february-morning-slot | 2,148 |
UoAPF2DwyhLv80BZsm1kmhsmt0e | chemistry | environmental-chemistry | air-pollution | The type of pollution that gets increased during the day time and in the presence of O<sub>3</sub> is : | [{"identifier": "A", "content": "Oxidising smog"}, {"identifier": "B", "content": "Global warming"}, {"identifier": "C", "content": "Acid rain"}, {"identifier": "D", "content": "Reducing smog"}] | ["A"] | null | Photochemical smog occurs in warm, dry, and
sunny climates. It is also called oxidizing smog. The
main components of photochemical smog are
ozone, nitric oxide, acrolein, formaldehyde, and PAN. | mcq | jee-main-2021-online-16th-march-morning-shift | 2,149 |
ixcHp5ekYX9kWuAXsQ1kmj7e1ma | chemistry | environmental-chemistry | air-pollution | Reducing smog is a mixture of : | [{"identifier": "A", "content": "Smoke, fog and O<sub>3</sub>"}, {"identifier": "B", "content": "Smoke, fog and N<sub>2</sub>O<sub>3</sub>"}, {"identifier": "C", "content": "Smoke, fog and CH<sub>2</sub> = CH $$-$$ CHO"}, {"identifier": "D", "content": "Smoke, fog and SO<sub>2</sub>"}] | ["D"] | null | Classical smog occurs in a cool humid climate, it is a mixture of smoke, fog, and SO<sub>2</sub>. It is known as reducing smog. | mcq | jee-main-2021-online-17th-march-morning-shift | 2,150 |
1ktcnmexm | chemistry | environmental-chemistry | air-pollution | Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). <br/><br/>Assertion (A) : Photochemical smog causes cracking of rubber.<br/><br/>Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizi... | [{"identifier": "A", "content": "Both (A) and (R) are true but (R) is not the true explanation of (A)"}, {"identifier": "B", "content": "(A) is false but (R) is true."}, {"identifier": "C", "content": "(A) is true but (R) is false."}, {"identifier": "D", "content": "Both (A) and (R) are true and (R) is the true explana... | ["D"] | null | Photochemical smog causes cracking of rubber, the common component of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyel nitrate (PAN). | mcq | jee-main-2021-online-26th-august-evening-shift | 2,152 |
1ktec57j8 | chemistry | environmental-chemistry | air-pollution | The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are : | [{"identifier": "A", "content": "$$Cl\\mathop O\\limits^ \\bullet + \\mathop C\\limits^ \\bullet {F_2}Cl$$"}, {"identifier": "B", "content": "$$Cl\\mathop O\\limits^ \\bullet + C\\mathop {{H_3}}\\limits^ \\bullet $$"}, {"identifier": "C", "content": "$$\\mathop C\\limits^ \\bullet {H_3} + C\\mathop {{F_2}}\\limi... | ["D"] | null | In stratosphere CFCs get broken down by powerful UV radiations releasing $$C{l^ \bullet }$$<br><br>$$C{F_2}C{l_2}(g)\buildrel {U.V.} \over
\longrightarrow C{l^ \bullet }(g) + {}^ \bullet C{F_2}Cl(g)$$ | mcq | jee-main-2021-online-27th-august-morning-shift | 2,153 |
1ktjvhdl1 | chemistry | environmental-chemistry | air-pollution | The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are : | [{"identifier": "A", "content": "X = Ammonium salts, Y = CO<sub>2</sub>"}, {"identifier": "B", "content": "X = SO<sub>2</sub>, Y = Ammonium salts"}, {"identifier": "C", "content": "X = Ammonium salts, Y = SO<sub>2</sub>"}, {"identifier": "D", "content": "X = CO<sub>2</sub>, Y = SO<sub>2</sub>"}] | ["C"] | null | Oxides of nitrogen and sulphur are acidic and settle down on ground as dry deposition.<br><br>Ammonium salts in rain drops result in wet deposition. | mcq | jee-main-2021-online-31st-august-evening-shift | 2,155 |
1l549iaam | chemistry | environmental-chemistry | air-pollution | <p>The acid that is believed to be mainly responsible for the damage of Taj Mahal is :</p> | [{"identifier": "A", "content": "sulfuric acid."}, {"identifier": "B", "content": "hydrofluoric acid."}, {"identifier": "C", "content": "phosphoric acid."}, {"identifier": "D", "content": "hydrochloric acid."}] | ["A"] | null | CaCO<sub>3</sub> + H<sub>2</sub>SO<sub>4</sub> $$ \to $$ CaSO<sub>4</sub> + H<sub>2</sub>O + CO<sub>2</sub><br/><br/>
Industries like oil refinery releases SO<sub>2</sub> which causes air pollution. It reacts with water to form acid rain when SO<sub>2</sub> mix with water it forms H<sub>2</sub>SO<sub>4</sub> (Sulphuric... | mcq | jee-main-2022-online-29th-june-morning-shift | 2,156 |
1l55ne09g | chemistry | environmental-chemistry | air-pollution | <p>Correct statement about photo-chemical smog is :</p> | [{"identifier": "A", "content": "It occurs in humid climate."}, {"identifier": "B", "content": "It is a mixture of smoke, fog and SO<sub>2</sub>."}, {"identifier": "C", "content": "It is reducing smog."}, {"identifier": "D", "content": "It results from reaction of unsaturated hydrocarbons."}] | ["D"] | null | Photochemical smog occurs in warm, dry and
sunny climate. The main components of
photochemical smog result from the action of
unsaturated hydrocarbons and nitrogen oxides.
This is an oxidising smog. | mcq | jee-main-2022-online-28th-june-evening-shift | 2,157 |
1l56xv6cq | chemistry | environmental-chemistry | air-pollution | <p>On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrite gives A and B while its reaction with its reaction with HCl produces B and C. A, B and C are, respectively :</p> | [{"identifier": "A", "content": "HOCl, HNO<sub>3</sub>, Cl<sub>2</sub>"}, {"identifier": "B", "content": "Cl<sub>2</sub>, HNO<sub>3</sub>, HOCl"}, {"identifier": "C", "content": "HClO<sub>2</sub>, HNO<sub>2</sub>, HOCl"}, {"identifier": "D", "content": "HOCl, HNO<sub>2</sub>, Cl<sub>2</sub>O"}] | ["A"] | null | On the surface of polar stratospheric clouds,
hydrolysis of chlorine nitrate as<br/><br/>
$$\mathrm{ClONO}_{2}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \underset{\mathrm{A}}{\mathrm{HOCl}}+\underset{\mathrm{B}}{\mathrm{HNO}_{3}}$$<br/><br/>
$$\mathrm{ClONO}_{2}+\mathrm{HCl} \longrightarrow \underset{\mathrm{C}}{\mathr... | mcq | jee-main-2022-online-27th-june-evening-shift | 2,158 |
1l57s6my9 | chemistry | environmental-chemistry | air-pollution | <p>Given below are two Statements:</p>
<p>Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide.</p>
<p>Statement II : Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc.</p>
<p>In the light of the above statements, cho... | [{"identifier": "A", "content": "Both Statement I and Statement II are correct."}, {"identifier": "B", "content": "Both Statement I and Statement II are incorrect."}, {"identifier": "C", "content": "Statement I is correct but Statement II is incorrect."}, {"identifier": "D", "content": "Statement I is incorrect but Sta... | ["A"] | null | (I) Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide. This is a correct statement.
<br/><br/>
(II) This statement is also based on fact and is a correct statement. | mcq | jee-main-2022-online-27th-june-morning-shift | 2,159 |
1l6e1c4y6 | chemistry | environmental-chemistry | air-pollution | <p>The photochemical smog does not generally contain :</p> | [{"identifier": "A", "content": "NO"}, {"identifier": "B", "content": "NO<sub>2</sub>"}, {"identifier": "C", "content": "SO<sub>2</sub>"}, {"identifier": "D", "content": "HCHO"}] | ["C"] | null | Photochemical smog contain:
<br/><br/>
Ozone, nitric oxide, organic compounds, nitrogen dioxide, formaldehyde.
<br/><br/>
$$\therefore \mathrm{SO}_{2}$$ is not the part of photochemical smog. | mcq | jee-main-2022-online-25th-july-morning-shift | 2,161 |
1ldr3lqav | chemistry | environmental-chemistry | air-pollution | <p>Formation of photochemical smog involves the following reaction in which $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ are respectively.</p>
<p>$$
\begin{aligned}
& \text { i. } \mathrm{NO}_{2} \stackrel{\mathrm{h} v}{\longrightarrow} \mathrm{A}+\mathrm{B} \\
& \text { ii. } \mathrm{B}+\mathrm{O}_{2} \righta... | [{"identifier": "A", "content": "$$\\mathrm{NO}, \\mathrm{O} ~\\& ~\\mathrm{O}_{3}$$"}, {"identifier": "B", "content": "$$\\mathrm{N}, \\mathrm{O}_{2} ~\\& ~\\mathrm{O}_{3}$$"}, {"identifier": "C", "content": "$$\\mathrm{O}, \\mathrm{N}_{2} \\mathrm{O} ~\\& ~\\mathrm{NO}$$"}, {"identifier": "D", "content": "$$\\mathrm{... | ["A"] | null | <p>(i) $$N{O_2}\buildrel {hv} \over
\longrightarrow {{NO} \over {(A)}} + {O \over {(B)}}$$</p>
<p>(ii) $${O \over {(B)}} + {O_2}\buildrel {} \over
\longrightarrow {{{O_3}} \over {(C)}}$$</p>
<p>(iii) $${{NO} \over {(A)}} + {{{O_3}} \over {(C)}}\buildrel {} \over
\longrightarrow N{O_2} + {O_2}$$</p> | mcq | jee-main-2023-online-30th-january-morning-shift | 2,164 |
1ldsr2hjm | chemistry | environmental-chemistry | air-pollution | <p>Correct statement about smog is :</p> | [{"identifier": "A", "content": "NO$$_2$$ is present in classical smog"}, {"identifier": "B", "content": "Both NO$$_2$$ and SO$$_2$$ are present in classical smog"}, {"identifier": "C", "content": "Photochemical smog has high concentration of oxidizing agents"}, {"identifier": "D", "content": "Classical smog also has h... | ["C"] | null | Photochemical smog has high concentration of
oxidising agents<br/><br/>
NO<sub>2</sub> is produced from NO and O<sub>3</sub> in the presence
of sunlight<br/><br/>
Classical smog contain smoke, fog and SO<sub>2</sub> and it
is known as reducing smog, as chemically it is
reducing mixture | mcq | jee-main-2023-online-29th-january-morning-shift | 2,165 |
1lduko4ka | chemistry | environmental-chemistry | air-pollution | <p>Some reactions of NO$$_2$$ relevant to photochemical smog formation are</p>
<p><img src="data:image/png;base64,UklGRvIIAABXRUJQVlA4IOYIAAAwhgCdASoAAywBP4HA2WU2MKynIZKZesAwCWlu/F+4Lr0HZ19/s/6Scm3tjl9BCm6V///VcWN1rG61jdaxrVLfLZ3GfLbUexbp6iiYD/5Oi8nReTovFki0f89UWRwUjwoXjgr7s2Dnb329hqz5HYEkAp57jdu3+IYHFfpA9VS5wLX+B5ZtZb... | [{"identifier": "A", "content": "$$\\mathrm{X = [O],Y = NO,A = {O_2},B = {O_3}}$$"}, {"identifier": "B", "content": "$$\\mathrm{X = {N_2}O,Y = [O],A = {O_3},B = NO}$$"}, {"identifier": "C", "content": "$$\\mathrm{X = {1 \\over 2}{O_2},Y = N{O_2},A = {O_3},B = {O_2}}$$"}, {"identifier": "D", "content": "$$\\mathrm{X = N... | ["A"] | null | <img src="https://app-content.cdn.examgoal.net/fly/@width/image/1lebw9ven/970ec104-827e-43cd-8363-f575de586f39/7b153400-b09b-11ed-aed4-45743bda0b59/file-1lebw9veo.png?format=png" data-orsrc="https://app-content.cdn.examgoal.net/image/1lebw9ven/970ec104-827e-43cd-8363-f575de586f39/7b153400-b09b-11ed-aed4-45743bda0b59/fi... | mcq | jee-main-2023-online-25th-january-morning-shift | 2,166 |
1ldwv3imz | chemistry | environmental-chemistry | air-pollution | <p>Correct statement is :</p> | [{"identifier": "A", "content": "An average human being consumes more food than air"}, {"identifier": "B", "content": "An average human being consumes 100 times more air than food"}, {"identifier": "C", "content": "An average human being consumes nearly 15 times more air than food"}, {"identifier": "D", "content": "An ... | ["C"] | null | The correct statement is <b>An average human being consumes nearly 15 times more air than food</b>.
<br/><br/>
This is because humans need to breathe in a certain amount of air to supply oxygen to the body and release carbon dioxide, which is produced by cellular respiration. On the other hand, the amount of food an av... | mcq | jee-main-2023-online-24th-january-evening-shift | 2,167 |
1ldyfc02b | chemistry | environmental-chemistry | air-pollution | <p>Which of the following is true about freons?</p> | [{"identifier": "A", "content": "These are radicals of chlorine and chlorine monoxide"}, {"identifier": "B", "content": "These are chemicals causing skin cancer"}, {"identifier": "C", "content": "All radicals are called freons"}, {"identifier": "D", "content": "These are chlorofluorocarbon compounds"}] | ["D"] | null | Freons are a family of chlorofluorocarbon (CFC) compounds, which are chemicals that contain chlorine, fluorine, and carbon atoms. They are used in a variety of applications, including refrigeration and air conditioning, as well as in aerosol spray cans. | mcq | jee-main-2023-online-24th-january-morning-shift | 2,168 |
lgo04s00 | chemistry | environmental-chemistry | air-pollution | The possibility of photochemical smog formation will be minimum at : | [{"identifier": "A", "content": "Mumbai in May"}, {"identifier": "B", "content": "Kolkata in October"}, {"identifier": "C", "content": "New-Delhi in August (Summer)"}, {"identifier": "D", "content": "Srinagar, Jammu and Kashmir in January"}] | ["D"] | null | The formation of photochemical smog depends on several factors, including sunlight, temperature, and the presence of pollutants such as nitrogen oxides and volatile organic compounds.
<br/><br/>
Option (A) Mumbai in May may also have some possibility of photochemical smog formation because the temperature and sunlight... | mcq | jee-main-2023-online-15th-april-morning-shift | 2,169 |
1lgp2n3ge | chemistry | environmental-chemistry | air-pollution | <p>Which of the following are the Green house gases?</p>
<p>A. Water vapour</p>
<p>B. Ozone</p>
<p>C. I$$_2$$</p>
<p>D. Molecular hydrogen</p>
<p>Choose the most appropriate answer from the options given below :</p> | [{"identifier": "A", "content": "A and D only"}, {"identifier": "B", "content": "A and B only"}, {"identifier": "C", "content": "B and C only"}, {"identifier": "D", "content": "C and D only"}] | ["B"] | null | Green house gases are $\mathrm{CO}_2, \mathrm{CH}_4$, water vapour, nitrous oxide, $\mathrm{CFC}_8$ and ozone. | mcq | jee-main-2023-online-13th-april-evening-shift | 2,170 |
1lgq3usi7 | chemistry | environmental-chemistry | air-pollution | <p>The radical which mainly causes ozone depletion in the presence of UV radiations is :</p> | [{"identifier": "A", "content": "$$\\mathrm{NO}^\\cdot$$"}, {"identifier": "B", "content": "$$\\mathrm{CH}_{3} ^\\cdot$$"}, {"identifier": "C", "content": "$$\\dot{\\mathrm{Cl}}$$"}, {"identifier": "D", "content": "$$\\dot{\\mathrm{O}} \\mathrm{H}$$"}] | ["C"] | null | The radical that mainly causes ozone depletion in the presence of UV radiation is $\dot{\mathrm{Cl}}$. The chloro radical reacts with ozone molecules to form chlorine monoxide and oxygen:
<br/><br/>
$$\dot{\mathrm{Cl}} + \mathrm{O}_{3} \rightarrow \mathrm{ClO} + \mathrm{O}_{2}$$
<br/><br/>
This reaction depletes the oz... | mcq | jee-main-2023-online-13th-april-morning-shift | 2,171 |
1lgsy97rh | chemistry | environmental-chemistry | air-pollution | <p>Which of the following compounds is an example of Freon?</p> | [{"identifier": "A", "content": "$$\\mathrm{C}_{2} \\mathrm{H}_{2} \\mathrm{F}_{2}$$"}, {"identifier": "B", "content": "$$\\mathrm{C}_{2} \\mathrm{HF}_{3}$$"}, {"identifier": "C", "content": "$$\\mathrm{C}_{2} \\mathrm{F}_{4}$$"}, {"identifier": "D", "content": "$$\\mathrm{C}_{2} \\mathrm{Cl}_{2} \\mathrm{F}_{2}$$"}] | ["D"] | null | <p>Freons are a class of compounds which are also known as chlorofluorocarbons (CFCs). As the name suggests, these compounds contain carbon, chlorine, and fluorine atoms. So the compound that is an example of a Freon from the options given is :</p>
<p>Option D : $$\mathrm{C}_{2} \mathrm{Cl}_{2} \mathrm{F}_{2}$$</p>
<p>... | mcq | jee-main-2023-online-11th-april-evening-shift | 2,172 |
1lgvuqdzz | chemistry | environmental-chemistry | air-pollution | <p>The delicate balance of $$\mathrm{CO}_{2}$$ and $$\mathrm{O}_{2}$$ is NOT disturbed by :</p> | [{"identifier": "A", "content": "Burning of Coal"}, {"identifier": "B", "content": "Burning of petroleum"}, {"identifier": "C", "content": "Respiration"}, {"identifier": "D", "content": "Deforestation"}] | ["C"] | null | <p>The delicate balance of $\mathrm{CO}_2$ and $\mathrm{O}_2$ is disturbed by the burning of coal (Option A), the burning of petroleum (Option B), and deforestation (Option D). These activities contribute to the increase in atmospheric $\mathrm{CO}_2$ levels, which can lead to global warming and climate change.</p>
<p>... | mcq | jee-main-2023-online-10th-april-evening-shift | 2,173 |
a0rXrzsqTpw83J1Ujrmpe | chemistry | environmental-chemistry | environmental-pollution | Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution? | [{"identifier": "A", "content": "Tetrachloroethylene"}, {"identifier": "B", "content": "Carbon dioxide"}, {"identifier": "C", "content": "Sulphur dioxide"}, {"identifier": "D", "content": "Nitrogen dioxide"}] | ["B"] | null | <p>Out of the given options, the substance that is a better strategy to control environmental pollution in dry cleaning is carbon dioxide (CO<sub>2</sub>).</p>
<p><b>Option A</b>: Tetrachloroethylene, also known as perchloroethylene (PERC), is a commonly used solvent in dry cleaning. However, it is a hazardous air poll... | mcq | jee-main-2016-online-10th-april-morning-slot | 2,177 |
50oaAYiPx3AP3qZTRO0LS | chemistry | environmental-chemistry | environmental-pollution | Which of the following is a set of greenhouse gases? | [{"identifier": "A", "content": "CH<sub>4</sub>, O<sub>3</sub>, N<sub>2</sub>, SO<sub>2</sub> "}, {"identifier": "B", "content": "O<sub>3</sub>, N<sub>2</sub>, CO<sub>2</sub>, NO<sub>2</sub>"}, {"identifier": "C", "content": "O<sub>3</sub>, NO<sub>2</sub>, SO<sub>2</sub>, Cl<sub>2</sub> "}, {"identifier": "D", "content... | ["D"] | null | The gases that contribute to greenhouse effect are called greenhouse gases. These include CO<sub>2</sub> , CH<sub>4</sub> , N<sub>2</sub>O and O<sub>3</sub>. | mcq | jee-main-2017-online-9th-april-morning-slot | 2,178 |
xhI9smiCG3gEv4KCfqC18 | chemistry | environmental-chemistry | environmental-pollution | <b>Assertion :</b> Ozone is destroyed by CFCs in the upper stratosphere.<br/><br/>
<b>Reason :</b> Ozone holes increase the amount of UV radiation the earth. | [{"identifier": "A", "content": "Assertion and reason are both correct, and the reason is the correct explanation for the\nassertion."}, {"identifier": "B", "content": "Assertion and reason are incorrect."}, {"identifier": "C", "content": "Assertion and reason are correct but, the reason is not the explanation for the ... | ["C"] | null | CFC’s are responsible for depletion of ozone
layer.
<br><br>When the ozone holes increases more UV rays will enter the earth.
<br><br>So here both Assertion and reason are correct but reason is not the correct explanation for why CFC is destroying the ozone layer. | mcq | jee-main-2019-online-8th-april-morning-slot | 2,180 |
0IyyWxNjhEp6Ibjt9FEi3 | chemistry | environmental-chemistry | environmental-pollution | Which is wrong with respect to our responsiblity as a human being to protect our environment? | [{"identifier": "A", "content": "Restricting the use of vehicles"}, {"identifier": "B", "content": "Setting up compost tin in gardens."}, {"identifier": "C", "content": "Avoiding the use of floodlighted facilities"}, {"identifier": "D", "content": "Using plastic bags."}] | ["D"] | null | Plastic bag is harmful for our eviroment an plastic is non bio-degradable polutant. | mcq | jee-main-2019-online-8th-april-morning-slot | 2,181 |
aoCftFz0i9yWjknXk36xp | chemistry | environmental-chemistry | environmental-pollution | The layer of atmosphere between 10 km to
50 km above the sea level is called as : | [{"identifier": "A", "content": "mesosphere"}, {"identifier": "B", "content": "thermosphere"}, {"identifier": "C", "content": "troposphere"}, {"identifier": "D", "content": "stratosphere"}] | ["D"] | null | Between 10-50 km above sea level is the lowest level which is called
stratosphere. | mcq | jee-main-2019-online-9th-april-evening-slot | 2,182 |
TOm87Abp0qmvBD6ENE3rsa0w2w9jwv4lwq9 | chemistry | environmental-chemistry | environmental-pollution | The regions of the atmosphere, where clouds form and where we live, respectively, are : | [{"identifier": "A", "content": "Stratosphere and Stratosphere"}, {"identifier": "B", "content": "Stratosphere and Troposphere"}, {"identifier": "C", "content": "Troposphere and Stratosphere"}, {"identifier": "D", "content": "Troposphere and Troposphere "}] | ["D"] | null | The lowest region of atmosphere in which
human beings live is troposphere. It extends up
to a height of 10 km from sea level. Clouds are
also formed in this layer | mcq | jee-main-2019-online-10th-april-morning-slot | 2,183 |
NmeOuE6SmdsVKrRsK41klrdx8mx | chemistry | environmental-chemistry | environmental-pollution | The gas released during anaerobic degradation of vegetation may lead to : | [{"identifier": "A", "content": "Ozone hole"}, {"identifier": "B", "content": "Corrosion of metals"}, {"identifier": "C", "content": "Acid rain"}, {"identifier": "D", "content": "Global warming and cancer"}] | ["D"] | null | Methane (CH<sub>4</sub>)
gas is evolved due to anaerobic degradation of
vegetation which causes global warming and cancer. It is a heat
trapping gas that forces the planet to warm drastically and quickly. | mcq | jee-main-2021-online-24th-february-morning-slot | 2,187 |
UZAkLUdt9D9tnCL0ud1kmitc0bl | chemistry | environmental-chemistry | environmental-pollution | The green house gas/es is (are) :<br/><br/>(A) Carbon dioxide<br/><br/>(B) Oxygen<br/><br/>(C) Water vapour<br/><br/>(D) Methane<br/><br/>Choose the most appropriate answer from the options given below : | [{"identifier": "A", "content": "(A) and (C) only"}, {"identifier": "B", "content": "(A) and (B) only"}, {"identifier": "C", "content": "(A), (C) and (D) only"}, {"identifier": "D", "content": "(A) only"}] | ["C"] | null | Greenhouse gases are CO<sub>2</sub>, CH<sub>4</sub>, Water vapour, Nitrous oxide, CFCs and ozone. | mcq | jee-main-2021-online-16th-march-evening-shift | 2,189 |
1krrjbrej | chemistry | environmental-chemistry | environmental-pollution | Which one of the following gases is reported to retard photosynthesis? | [{"identifier": "A", "content": "CO"}, {"identifier": "B", "content": "CFCs"}, {"identifier": "C", "content": "CO<sub>2</sub>"}, {"identifier": "D", "content": "NO<sub>2</sub>"}] | ["D"] | null | According to NCERT only NO<sub>2</sub> from the given options can retard the photosynthesis process in plants. | mcq | jee-main-2021-online-20th-july-evening-shift | 2,192 |
1ktfsctvl | chemistry | environmental-chemistry | environmental-pollution | Which one of the following is used to remove most of plutonium from spent nuclear fuel? | [{"identifier": "A", "content": "ClF<sub>3</sub>"}, {"identifier": "B", "content": "O<sub>2</sub>F<sub>2</sub>"}, {"identifier": "C", "content": "I<sub>2</sub>O<sub>5</sub>"}, {"identifier": "D", "content": "BrO<sub>3</sub>"}] | ["B"] | null | O<sub>2</sub>F<sub>2</sub> oxidizes plutonium to PuF<sub>6</sub> and the reaction is used in removing plutonium as PuF<sub>6</sub> from spent nuclear fuel. | mcq | jee-main-2021-online-27th-august-evening-shift | 2,193 |
1l5bdctfh | chemistry | environmental-chemistry | environmental-pollution | <p>Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.</p> | [{"identifier": "A", "content": "CH<sub>4</sub>"}, {"identifier": "B", "content": "O<sub>3</sub>"}, {"identifier": "C", "content": "H<sub>2</sub>O"}, {"identifier": "D", "content": "N<sub>2</sub>"}] | ["D"] | null | Among the given gases, the green house gases
which are responsible for heating the atmosphere
are CH<sub>4</sub>, water vapour and ozone. Nitrogen is not a
green house gas. | mcq | jee-main-2022-online-24th-june-evening-shift | 2,194 |
1l6kpwdea | chemistry | environmental-chemistry | environmental-pollution | <p>Given below are two statements:</p>
<p>Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry.</p>
<p>Statement II : The fuel obtained from plastic waste is lead free.</p>
<p>In the light of the above statements, choose the most appropriate answer from the options gi... | [{"identifier": "A", "content": "Both Statement I and Statement II are correct"}, {"identifier": "B", "content": "Both Statement I and Statement II are incorrect"}, {"identifier": "C", "content": "Statement I is correct but Statement II is incorrect"}, {"identifier": "D", "content": "Statement I is incorrect but Statem... | ["A"] | null | Both Statement are correct.
<br/><br/>
- Fuel obtained from plastic waste has high octane rating. It contain no lead and is known as "green fuel".
<br/><br/>
- The non bio-degradable fly ash and slag from steel industry can be used by cement industry. | mcq | jee-main-2022-online-27th-july-evening-shift | 2,196 |
1lgrkihse | chemistry | environmental-chemistry | environmental-pollution | <p>Match List I with List II</p>
<p><style type="text/css">
.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidden;padding:10px 5px;word-break:normal;}
.tg th{border-color:black;border-style:solid;bo... | [{"identifier": "A", "content": "A-II, B-III, C-I, D-IV"}, {"identifier": "B", "content": "A-I, B-II, C-III, D-IV"}, {"identifier": "C", "content": "A-IV, B-II, C-III, D-I"}, {"identifier": "D", "content": "A-IV, B-III, C-II, D-I"}] | ["D"] | null | Let's match the items in List I with the items in List II:
<br/><br/>
A. Nitrogen oxides in air - These are responsible for acid rain. So, A-IV.
<br/><br/>
B. Methane in air - Methane is a greenhouse gas, contributing to global warming. So, B-III.
<br/><br/>
C. Carbon dioxide - Normal rain water has a pH of 5.6 (slight... | mcq | jee-main-2023-online-12th-april-morning-shift | 2,198 |
1lgygyxfc | chemistry | environmental-chemistry | environmental-pollution | <p>Match List I with List II</p>
<p><style type="text/css">
.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidden;padding:10px 5px;word-break:normal;}
.tg th{border-color:black;border-style:solid;bo... | [{"identifier": "A", "content": "(A)-(III), (B)-(II), (C)-(I), (D)-(IV)"}, {"identifier": "B", "content": "(A)-(III), (B)-(IV), (C)-(I), (D)-(II)"}, {"identifier": "C", "content": "(A)-(IV), (B)-(I), (C)-(II), (D)-(III)"}, {"identifier": "D", "content": "(A)-(II), (B)-(III), (C)-(IV), (D)-(I)"}] | ["A"] | null | <p>A - Steel plants : They generate waste in the form of slag (III), which is a by-product of the smelting process used in steel production. </p>
<p>B - Thermal power plants : These plants generate fly ash (II) as a by-product of coal combustion. </p>
<p>C - Fertilizer industries : The manufacture of phosphate fertiliz... | mcq | jee-main-2023-online-10th-april-morning-shift | 2,199 |
1l6p7b23h | chemistry | environmental-chemistry | soil-pollution | <p>Which among the following pairs has only herbicides?</p> | [{"identifier": "A", "content": "Aldrin and Dieldrin"}, {"identifier": "B", "content": "Sodium chlorate and Aldrin"}, {"identifier": "C", "content": "Sodium arsinate and Dieldrin"}, {"identifier": "D", "content": "Sodium chlorate and sodium arsinite"}] | ["D"] | null | Both sodium chlorate and sodium arsenate behave as herbicide. | mcq | jee-main-2022-online-29th-july-morning-shift | 2,200 |
k1eF2Ps0qO9LFyR9 | chemistry | environmental-chemistry | water-pollution | The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found
to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to
high concentration of : | [{"identifier": "A", "content": "Lead"}, {"identifier": "B", "content": "Nitrate"}, {"identifier": "C", "content": "Iron"}, {"identifier": "D", "content": "Fluoride"}] | ["B"] | null | The maximum limit of nitrate in drinking water is $$50$$ ppm. Excess nitrate in drinking water can cause disease such as methemoglobinemia ('blue baby' syndrome). | mcq | jee-main-2016-offline | 2,202 |
S9yxTmxEHaHVB8Va | chemistry | environmental-chemistry | water-pollution | A water sample has ppm level concentration of following anions<br/>
F<sup>-</sup> = 10; $$SO_4^{2-}$$ = 100; $$NO_3^-$$ = 50<br/>
The anion/anions that make/makes the water sample unsuitable for drinking is/are : | [{"identifier": "A", "content": "both $$SO_4^{2-}$$ and $$NO_3^-$$"}, {"identifier": "B", "content": "only F<sup>-</sup>"}, {"identifier": "C", "content": "only $$SO_4^{2-}$$\n"}, {"identifier": "D", "content": "only $$NO_3^-$$\n"}] | ["B"] | null | Permissible limit for SO<sub>4</sub>
<sup>2-</sup>
= 500 ppm
<br><br>Permissible limit for NO<sub>3</sub>
<sup>-</sup>
= 50 ppm
<br><br>Permissible limit for F<sup>-</sup>
= 1 ppm | mcq | jee-main-2017-offline | 2,203 |
cp0XElnr3HAHyjDD | chemistry | environmental-chemistry | water-pollution | The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required
to make teeth enamel harder by converting <br/>[3Ca<sub>3</sub> (PO<sub>4</sub>)<sub>2</sub>.Ca(OH)<sub>2</sub>] to | [{"identifier": "A", "content": "[3{Ca(OH)<sub>2</sub>}. CaF<sub>2</sub>] "}, {"identifier": "B", "content": "[CaF<sub>2</sub>] \n"}, {"identifier": "C", "content": "[3(CaF<sub>2</sub>). Ca(OH)<sub>2</sub>] "}, {"identifier": "D", "content": "[3Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>. CaF<sub>2</sub>] "}] | ["D"] | null | <img src="https://res.cloudinary.com/dckxllbjy/image/upload/v1734264819/exam_images/wu3neerdmigavhn4xlkq.webp" style="max-width: 100%; height: auto;display: block;margin: 0 auto;" loading="lazy" alt="JEE Main 2018 (Offline) Chemistry - Environmental Chemistry Question 93 English Explanation"> | mcq | jee-main-2018-offline | 2,204 |
GOLG0wmJiyEAm7QYJscUq | chemistry | environmental-chemistry | water-pollution | Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ? | [{"identifier": "A", "content": "Aerobic bacteria decrease the BOD value."}, {"identifier": "B", "content": "Anaerobic bacteria increase the BOD value. "}, {"identifier": "C", "content": "Clean water has BOD value higher than 10 ppm."}, {"identifier": "D", "content": "Polluted water has BOD value higher than 10 ppm."}] | ["D"] | null | Aerobic bacteria decreases the BOD value and aerobic bacteria increase the BOD value. Clear water has BOD value less than 5 ppm. Polluted water has BOD value higher than 10 ppm. | mcq | jee-main-2018-online-15th-april-evening-slot | 2,205 |
QffYcH0xtL1fxMF01Zz7m | chemistry | environmental-chemistry | water-pollution | A water sample has ppm level concentration of the following metals : Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is : | [{"identifier": "A", "content": "Cu"}, {"identifier": "B", "content": "Mn"}, {"identifier": "C", "content": "Fe"}, {"identifier": "D", "content": "Zn"}] | ["B"] | null | When Mn present in water with concentration 0.05 ppm or more than this then the water is unsuitable for drinking.
<br><br>Here given concentration for Mn is 5.0, which is grater than 0.05 that is why it is Mn makes water unsuitable for drinking.
<br><br>For other metal water is suitable for drinking when concentratio... | mcq | jee-main-2019-online-9th-january-morning-slot | 2,206 |
niGPN9aBAYClqm1AZAyI9 | chemistry | environmental-chemistry | water-pollution | Which of the following conditions in drinking water causes methemoglobinemia? | [{"identifier": "A", "content": "> 50 ppm of lead"}, {"identifier": "B", "content": "> 50 ppm of chloride"}, {"identifier": "C", "content": "> 50 ppm of nitrate"}, {"identifier": "D", "content": "> 100 ppm of sulphate"}] | ["C"] | null | Concentration of nitrate > 50 ppm in drinking water causes methemoglobinemia | mcq | jee-main-2019-online-9th-january-evening-slot | 2,207 |
m1hf1bAWUFJwqwnq3byGL | chemistry | environmental-chemistry | water-pollution | Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them, is : | [{"identifier": "A", "content": "B is more polluted than A. "}, {"identifier": "B", "content": "A is suitable for drinking, whereas B is not ."}, {"identifier": "C", "content": "Both A and B are suitable for dirnking "}, {"identifier": "D", "content": "A is more polluted than B. "}] | ["A"] | null | Two glasses ''A'' and ''B'' have BOD values 10 and ''20'', respectively.
<br><br>Hence glasses ''B'' is more polluted than glasses ''A''. | mcq | jee-main-2019-online-10th-january-morning-slot | 2,208 |
YGp4iB1XX3gJaNtjH7ad1 | chemistry | environmental-chemistry | water-pollution | The concentration of dissolved oxygen (DO) in cold water can go upto : | [{"identifier": "A", "content": "14 ppm"}, {"identifier": "B", "content": "16 ppm"}, {"identifier": "C", "content": "8 ppm"}, {"identifier": "D", "content": "10 ppm"}] | ["D"] | null | In cold water, dissolved oxygen (DO) can reach a
concentration upto 10 ppm. | mcq | jee-main-2019-online-11th-january-morning-slot | 2,209 |
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