question_id string | question string | question_images list | option_1 string | option_2 string | option_3 string | option_4 string | correct_option int64 | numerical_answer string | solution string | solution_images list | subject string | topic string | subtopic string | difficulty string | question_type string | has_image bool | exam string | source_paper string |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CH-24-Q25 | In an experiment starting with 1 mole of ethyl alcohol, 1 mole
of acetic acid and 1 mole of water at TºC, the equilibrium mixture on
analysis shows that 54.3 of the acid is esterfied. Calculate the
equilibrium constant of this reaction. | [] | null | 4.0 | ${CH}_{3}COOH(I) + C_{2}H_{5}OH(l) \rightleftharpoons {CH}_{3}{COOC}_{2}H_{5}(l) + H_{2}O(l)$
Initial 1 1 0 1
At equilibrium 1 - x 1 - x x 1 + x
1 - 0.543 1 - 0.543 0.543 1 + 0.543
$\left( 54.3\%\ of\ 1mole = \frac{1 \times 54.3}{100} = 0.543mole \right)$
Hence given x = 0.543 mole
Applying law of mass action
$K_{C} = ... | [] | Chemistry | Physical Chemistry | Chemical Equilibrium | Moderate | numerical | false | JEE Main | CH-24 Chemistry Paper 31 Dec..docx | ||||
CH-10-Q10 | A solution of [IMAGE] -chloro-2-phenylethane in
toluene racemizes slowly in the presence of small amount of
[IMAGE] due to the formation of | [
"images/image48.png",
"images/image49.png"
] | Carbanion | Carbene | Free radical | Carbocation | 4 | null | [
"images/image50.png"
] | Chemistry | Organic Chemistry | Organic Chemistry | Easy | single_correct | true | JEE Main | CH-10 Chemistry Paper-1 30 Oct New Jee main.docx | |
CH-02-Q12 | Which of the following metal salt gives chromyl chloride test? | [] | KCI | null | null | This is a chemical test to detect chloride ion in the qualitative
analysis. Any chloride when heated with edified potassium dichromate
orange, red fumes of chromyl chloride are released. This confirms
presence of chloride. | [] | Chemistry | single_correct | false | JEE Main | CH-02 Chemistry paper 2.docx | ||||||
CH-02-Q6 | [IMAGE] In the above reaction,[IMAGE] acts as | [
"images/image41.png",
"images/image42.png"
] | oxidising agent | indicator | reducing agent | catalyst | null | null | Oxidation number of sulphur in [IMAGE] is
increasing so reacting as reducing agent | [
"images/image43.png"
] | Chemistry | single_correct | true | JEE Main | CH-02 Chemistry paper 2.docx | |||
CH-05-Q22 | Number of moles of CaO required to remove hardness from 1000
litre water having 324 ppm of calcium bicarbonate is | [] | null | null | Ca(HCO_3)_2 +
$\frac{324}{162}$ = n_CaO = 2 | [
"images/image42.png",
"images/image43.png"
] | Chemistry | Physical Chemistry | Some Basic Concepts of Chemistry | Moderate | single_correct | true | JEE Main | CH-05 Chemistry Paper 10 October.docx | ||||
CH-27-Q13 | The exothermic formation of ClF3 is represented by the equation:
Cl2 (g) + 3F2 (g) [IMAGE] 2ClF3 (g); ΔrH = - 329 J
which of the following will increase the quantity of CIF3 in an
equilibrium mixture of Cl2, F2 and ClF3. | [
"images/image10.png"
] | Adding F2 | Increasing the volume of container | Removing Cl2 | Increasing the temperature
ClF_3 dh Cl2 (g) + 3F2 (g) [IMAGE] 2ClF3 (g); ΔrH = - 329 J | 1 | null | CI2 (g) + 3F2 (g)[IMAGE] 2CIF3 (g); DH = - 329
kJ. Favourable conditions:
(i) Decrease in temperature, (ii) Addition of reactants, (iii)
Increase in pressure i.e., decrease in volume.
CI2 (g) + 3F2 (g)[IMAGE] 2CIF3 (g); DH = - 329 kJ.
vuqdqy ifjfLFkfrA
(i) (ii) (iii) nkc | [
"images/image11.png",
"images/image11.png"
] | Chemistry | Physical Chemistry | Chemical Equilibrium | Moderate | single_correct | true | JEE Main | CH-27 Chemistry Paper 2 15 Jan.docx |
CH-19-Q22 | Chromium metal crystallizes with a body centered cubic lattice.
The length of the unit cell is found to be 287 pm. Calculate the atomic
radius. What would be the density of chromium in g/cm3? | [] | null | 124.27 | We know for B.C.C. $4R = a\sqrt{3}$
$R = \frac{287 \times \sqrt{3}}{4} = 124.27pm$
Density
$= \frac{2 \times 52}{6.023 \times 10^{23}{(287 \times 10^{- 10})}^{3}} = 7.30gm/{cm}^{3}$ | [] | Chemistry | BCC& Density | Easy | numerical | false | JEE Main | CH-19 Chemistry Paper 28 Nov. Fourth.docx | |||||
CH-27-Q33 | 6.02 × 1020 molecules of urea are present in 100 ml of its
solution. The concentration of urea solution is:
lkUnzrk | [] | null | 0.01 | Moles of urea
$= \frac{6.02 \times 10^{20}}{6.02 \times 10^{23}} = 10^{- 3}moles$
Concentration (molarity) of solution ¼eksyjrk½
$= \frac{10^{- 3}}{100} \times 1000 = 0.01M$ | [] | Chemistry | Physical Chemistry | Moderate | numerical | false | JEE Main | CH-27 Chemistry Paper 2 15 Jan.docx | |||||
CH-18-Q21 | The total number of cyclic isomers possible for a hydrocarbon
with the molecular formula C4H6 is / are | [] | null | 5 | The DU of C4H6 = | [] | Chemistry | IUPAC and Structural Isomerism | Easy | numerical | false | JEE Main | CH-18 Chemistry Paper 27 Nov. Third.docx | |||||
CH-22-Q12 | Consider the reaction sequence below:
[IMAGE] x is | [
"images/image9.png"
] | 4 | null | The complete sequence of reaction is given below. | [
"images/image14.png"
] | Chemistry | Organic Chemistry | Alcohools,Ether and Phenol | Tough | single_correct | true | JEE Main | CH-22 Chemistry Paper 19 Dec. Eng.docx | ||||
CH-07-Q9 | Which of the following is not used in rocket propellants | [] | $H_{2}(l)$ | $O_{2}(l)$ | $N_{2}H_{4}(l)$ | All of these | 4 | null | All are fuel. | [] | Chemistry | Organic Chemistry | Chemistry in everyday life | Easy | single_correct | false | JEE Main | CH-07 Chemistry Paper 17 October.docx |
CH-23-Q19 | [IMAGE] Where a, b, c, d, e, f, g, h are 3rd period elements. If difference
between atomic number of elements b and e is x and difference between
atomic number of elements c and f is y. What is the value of x - y. | [
"images/image53.png"
] | 0.1 | 0 | 1.0 | 01 | 2 | null | a is Na, b is Mg, c is Al, d is Si, e is P, f is S, g is Cl, h
is Ar,
x = 3, y = 3
x - y = 0 | [] | Chemistry | Inorganic Chemistry | Periodic table | Moderate | single_correct | true | JEE Main | CH-23 Chemistry Paper 31 Dec. FST.docx |
CH-10-Q12 | At constant T and P. which one of the following statements is
correct for the reaction, [IMAGE]. | [
"images/image55.png"
] | [IMAGE] is independent of the physical state of the
reactants of that compound | 3 | null | [
"images/image60.png",
"images/image58.png"
] | Chemistry | Physical Chemistry | Thermodynamics | Easy | single_correct | true | JEE Main | CH-10 Chemistry Paper-1 30 Oct New Jee main.docx | ||||
CH-18-Q20 | Pressure of the gas in column | [] | is | 55 cm of Hg | 50 cm of Hg | 45 cm of Hg | 1 | null | $P_{g = 1} = 75 - \frac{101}{2} - \frac{20 \times 6.8}{13.6} \times \frac{1}{2} = 60cm\ of\ Hg$ | [] | Chemistry | Ideal Gas | Ideal gas equation & gas laws | Easy | single_correct | false | JEE Main | CH-18 Chemistry Paper 27 Nov. Third.docx |
CH-21-Q23 | Consider Bohr's theory for hydrogen atom. The magnitude of
angular momentum, orbit radius and velocity of the electron in
n^thenergy state in a hydrogen atom are, r & v respectively. Find out
the value of if product of v, r and l (vrl) is directly
proportional to nx.
gkbMªkstu ijek.kq ds fy, cksj fl)kUr dks ekurs gq, g... | [] | null | 2 | Angular momentum, $\mathcal{l} = mvr = \frac{nh}{2\pi}$
$\therefore\mathcal{l}\infty\ n$
Radius, $r = 0.529\frac{n^{2}}{z}A^{0}$ $\therefore r\ \infty n^{2}$ For
same Z
Velocity, $v = 2.18 \times 10^{6}\frac{z}{n}m/s$
$\therefore v\infty\frac{1}{n}$
$\therefore vr\mathcal{l}\infty n \times n^{2} \times \frac{1}{n}$
But... | [] | Chemistry | Atomic Structure | Bohr Model | Tough | numerical | false | JEE Main | CH-21 Chemistry Paper 19 Dec. Eng Hindi.docx | ||||
CH-16-Q25 | Draw all structurally isomeric benzene containing isomers with
molecular formula [IMAGE] | [
"images/image42.png"
] | null | 5 | [
"images/image43.png",
"images/image44.png",
"images/image45.png",
"images/image46.png",
"images/image47.png"
] | Chemistry | IUPAC Nomenclature and Structural Isomerism | Number of Structural Isomers | Moderate | numerical | true | JEE Main | CH-16 Chemistry Paper 25 Nov. Fisrt.docx | |||||
CH-12-Q10 | Complex is formed in the extraction of | [] | Na | Cu | Ag | Fe | 3 | null | Hydrometallurgy
Ag_2 S + 4NaCN → 2Na[Ag(CN)_2 ] + Na_2 S | [] | Chemistry | Inorganic Chemistry | Metallurgy | Moderate | single_correct | false | JEE Main | CH-12 Chemistry Paper 2 Nov..docx |
CH-10-Q9 | The electrophile in the nitration of benzene is | [] | 1 | null | [IMAGE] is produced when conc.
[IMAGE] reacts with conc. [IMAGE]. | [
"images/image41.png",
"images/image45.png",
"images/image46.png",
"images/image47.png"
] | Chemistry | Organic Chemistry | Organic Chemistry | Tough | single_correct | true | JEE Main | CH-10 Chemistry Paper-1 30 Oct New Jee main.docx | ||||
CH-19-Q9 | Iron has body centerd cubic lattice structure. The edge length of
the unit cell is found to be 286 pm. What is the radius of an iron atom? | [] | r = 124 pm | r = 128 pm | r = 124 | r = 128 | 1 | null | For bcc structure
$\sqrt{3}a = 4r,r = \frac{\sqrt{3}a}{4} = \frac{1.732 \times 286}{4} = 123.8 \approx 124pm$ | [] | Chemistry | Simple Cubic Structure & BCC | Easy | single_correct | false | JEE Main | CH-19 Chemistry Paper 28 Nov. Fourth.docx | |
CH-16-Q11 | The possible structure of monothiocarbonate ion is | [] | 4 | null | The monothiocarbonate is CSO22- and carbon cannot have more
than 8 electrons in its valence shell. | [] | Chemistry | Chemical Bonding | Octet rule, Lewis dot structures | Moderate | single_correct | false | JEE Main | CH-16 Chemistry Paper 25 Nov. Fisrt.docx | ||||
CH-20-Q5 | Two separate bulbs contain ideal gases A and B. The density of
gas A is twice that of gas B. The molecular mass of A is half that of
gas B. The two gases are at the same temperature. The ratio of the
pressure of A to that of gas B is | [] | 2 | 4 | 3 | null | $d_{a} = 2d_{b};2M_{a} = M_{b}$
$PV = nRT = \frac{m}{M}RT;P = \frac{m}{V} \cdot \frac{RT}{M} = \frac{dRT}{M}$
$\frac{P_{a}}{P_{b}} = \frac{d_{a}}{d_{b}}\frac{M_{b}}{M_{a}} = \frac{2d_{b}}{d_{b}} \times \frac{2M_{a}}{M_{a}} = 4$ | [] | Chemistry | Physical Chemistry | Gaseous state | Moderate | single_correct | false | JEE Main | CH-20 Chemistry Paper 12 Dec..docx | ||
CH-19-Q18 | In the reaction
${({CH}_{3})}_{3}CCHO + HCHO\frac{NaOH}{heat}A + B$the products (A) and
(B) are respectively | [] | ${({CH}_{3})}_{3}{CCH}_{2}OH\ and{\ HCOO}^{-}{Na}^{+}$ | ${({CH}_{3})}_{3}CCOON\ aand{\ CH}_{3}OH$ | ${({CH}_{3})}_{3}{CCH}_{2}OH\ and\ {CH}_{3}OH$ | ${({CH}_{3})}_{3}COONa\ and\ {HCOO}^{-}{Na}^{+}$ | 1 | null | [
"images/image19.png"
] | Chemistry | Carbonyl Compound (Aldehyde and Ketone) | Cannizzaro's reactions | Tough | single_correct | true | JEE Main | CH-19 Chemistry Paper 28 Nov. Fourth.docx | |
CH-17-Q20 | A reaction, which is second order, has a rate constant of
[IMAGE]. If the initial conc. of the reactant is 0.2 M.
how long will it take for the concentration to become 0.0400 M? | [
"images/image64.png"
] | 1000 sec | 400 sec | 200 sec | 10,000 sec | 4 | null | [
"images/image65.png",
"images/image66.png",
"images/image67.png"
] | Chemistry | Chemical Kinetics | Integrated Rate law : Second Order & Pseudo first order | Moderate | single_correct | true | JEE Main | CH-17 Chemistry Paper 26 Nov. Second.docx | |
CH-04-Q23 | In the given, how many atoms have greater first ionisation energies
than Boron ?
?
Li Be C N O F He | [] | null | 06 | [] | Chemistry | Physical Chemistry | Periodic Table | Easy | numerical | false | JEE Main | CH-04 Paper 02 Chemistry with Hindi 22-8-2020.docx | |||||
CH-22-Q25 | The total number of cyclic structural as well as stereo isomers
possible for a compound with the molecular formula C5H10 is | [] | null | 7 | [
"images/image20.png",
"images/image21.png",
"images/image22.png",
"images/image23.png",
"images/image24.png",
"images/image25.png"
] | Chemistry | Organic Chemistry | Stereoisomerism | Moderate | numerical | true | JEE Main | CH-22 Chemistry Paper 19 Dec. Eng.docx | |||||
CH-06-Q1 | A particle X moving with certain velocity has a de-Broglie
wavelength of 1Aº. If particle and
velocity 75 that of will be | [] | 0.19 Aº | 5.33 Aº | 6.88 Aº | 4.8 Aº | 2 | null | $\frac{\lambda_{x}}{\lambda_{Y}} = \left\lbrack \frac{m_{Y}}{m_{x}} \right\rbrack \cdot \left\lbrack \frac{V_{Y}}{V_{x}} \right\rbrack$
= 2.25 × 0.75 = $\frac{3}{16};\lambda_{Y} = \frac{16}{3}\lambda_{x}$ =
5.33 Aº | [] | Chemistry | Physical Chemistry | Atomic Structure | Moderate | single_correct | false | JEE Main | CH-06 Chemistry Paper 14 October.docx |
CH-18-Q11 | What weights of P4O6 and P4O10 will be produced by the
combustion of 31g of P4 in 32g of oxygen leaving no P4 and O2. | [] | 2.75 g, 219.5 g | 27.5 g, 35.5 g | 55 g, 71 g | 17.5 g, 190.5 g | 2 | null | P4 + O2 → P4O6 + P4O10
31 gram 32 gram
According to question weight of P is conserved so
Let Mole of P4O6 = a
Mole of P4O10 = b
Initial weight of P = Final weight of P.
31 = × 31 + × 31
4 a + 4b = 1] (1) × 3
Initial weight of oxygen = Final weight of oxygen
32 = × 16 + × 16
3a + 5b = 1] (2) × 4
12 a + 20 b = 4
12 a + 1... | [] | Chemistry | Mole concept | Principle of atom conservation (POAC), Reactions in sequence | Tough | single_correct | false | JEE Main | CH-18 Chemistry Paper 27 Nov. Third.docx |
CH-08-Q24 | Total number of lone pair of electrons in XeOF_4 is | [] | null | 1 | Therefore, total number of lone pair of electron on central
atom Xenon =1 | [
"images/image30.png"
] | Chemistry | Inorganic Chemistry | p-block elements | Moderate | numerical | true | JEE Main | CH-08 Chemistry Paper 23 October.docx | ||||
CH-09-Q20 | Particulates matter contains ______ | [] | Chlorobenzene | Toluene | Nitrobenzene | Polycyclic hydrocarbons | 4 | null | Explanation: Polycyclic aromatic hydrocarbons (PAHs) are two or
more fused aromatic rings containing compounds, form by various
anthropogenic processes and present in both particulate and gaseous
phases. | [] | Chemistry | Inorganic Chemistry | Environmental Chemistry | Moderate | single_correct | false | JEE Main | CH-09 Chemistry Paper 26 October.docx |
CH-10-Q18 | The enthalpy change for the transition of liquid water to steam.
[IMAGE]. The entropy change for the process is | [
"images/image88.png"
] | 3 | null | [
"images/image93.png",
"images/image94.png"
] | Chemistry | Physical Chemistry | Thermodynamics | Moderate | single_correct | true | JEE Main | CH-10 Chemistry Paper-1 30 Oct New Jee main.docx | |||||
CH-18-Q12 | Which is the correct relationship? | [] | E1 of H = E3 of Li2+ = 1/4 E4 of Be3+ | E1(H) = E2(He+) = E3 (Li2+) = E4(Be3+) | E1(H) = 2E2(He+) = 3E3 (Li2+) = 4E4(Be3+) | No relation | 2 | null | $E_{1}(H) = - 13.6 \times \frac{1^{2}}{1^{2}} = - 13.6eV$
$E_{2}({He}^{+}) = - 13.6 \times \frac{2^{2}}{2^{2}} = - 13.6eV$
$E_{3}({Li}^{2 +}) = - 13.6 \times \frac{3^{2}}{3^{2}} = - 13.6eV$
$E_{4}({Be}^{3 +}) = - 13.6 \times \frac{4^{2}}{4^{2}} = - 13.6eV$
$\therefore E_{1}(H) = E_{2}({He}^{+}) = E_{3}({Li}^{2 +}) = E_... | [] | Chemistry | Atomic Structure | Bohr Model | Moderate | single_correct | false | JEE Main | CH-18 Chemistry Paper 27 Nov. Third.docx |
CH-27-Q19 | Which of the following compound is not suitable to obtain from
wurtz reaction? | [] | ethane | butane | isobutane | hexane
mi;qDr ugha | 3 | null | Wurtz reaction is not suitable for the preparation of isobutane
because two different alkylhalides are used for the preparation of
isobutane so, mixture of three different compounds are produced which is
very difficult to separate in pure form.
Wurtz reaction fy, rhu vyx&vyx feJ.k mRiUu gksrk gS tks "kq):i | [
"images/image18.png",
"images/image19.png",
"images/image20.png",
"images/image21.png"
] | Chemistry | Organic Chemistry | Hydrocarbon | Moderate | single_correct | true | JEE Main | CH-27 Chemistry Paper 2 15 Jan.docx |
CH-24-Q17 | For a solution obtained by mixing equal volumes of 0.02 M KOH
solution & 0.2 M B (weak diacidic base; = 10^-7 &
[IMAGE] = 10^-14) solution | [
"images/image25.png"
] | pH = 12 | [BH^+] = 10^-6 M | $\left\lbrack {BH}_{2}^{2 +} \right\rbrack = 10^{- 18}M$ | All of these | 4 | null | $\left\lbrack {OH}^{-} \right\rbrack = \frac{0.02}{2} = 0.01M\therefore pH = 12$
$10^{- 7} = \frac{0.01\left\lbrack {BH}^{+} \right\rbrack}{0.1} \Rightarrow \left\lbrack {BH}^{+} \right\rbrack = 10^{- 6}M$
$10^{- 7} \times 10^{- 14} = \frac{(0.01)^{2}\left\lbrack {BH}_{2}^{2 +} \right\rbrack}{0.1} \Rightarrow \left\lbr... | [] | Chemistry | Physical Chemistry | Ionic Equilibrium | Moderate | single_correct | true | JEE Main | CH-24 Chemistry Paper 31 Dec..docx |
CH-13-Q23 | A dry air is passed through the solution containing the 10 gm of
solute and 90 gm of water and then it pass through pure water. There is
the depression in weight of solution wt by 2.5 gm and in weight of pure
solvent by 0.05 gm. Calculate the molecular weight of solute.7 | [] | null | 100 | Lowering in weight of solution[IMAGE] solution
pressure
Lowering in weight of solvent[IMAGE] P^0 - P_s
([IMAGE] P^0 = vapour pressure of pure solvent) | [
"images/image36.png",
"images/image37.png",
"images/image38.png",
"images/image39.png",
"images/image40.png",
"images/image41.png"
] | Chemistry | Physical Chemistry | Moderate | numerical | true | JEE Main | CH-13 Chemistry Paper 4 Nov..docx | |||||
CH-12-Q9 | Purpose of smelting of an ore is | [] | To oxidize it | To reduce it | To remove vaporizable impurities | To obtain an alloy | 2 | null | Smelting is a process of reducing metal oxide to metal by means
of coke or CO.
Fe_2 O_3 + 3C → 2Fe + 3CO
Fe_2 O_3 + 3CO → 2Fe + 3CO_2 | [] | Chemistry | Inorganic Chemistry | Metallurgy | Moderate | single_correct | false | JEE Main | CH-12 Chemistry Paper 2 Nov..docx |
CH-26-Q2 | The freezing point (in ºC) of a solution containing 0.1 g of
K3[Fe(CN)6] (Mol. Wt. 329) in 100 g of water (Kf = 1.86 K kg mol-1)
is:
100 g ty (Kf = 1.86 K kg mol-1) esa 0.1 g K3[Fe(CN)6] (v.kq Hkkj =
329) ds ?kqyus | [] | - 2.3 × 10-2 | - 5.7 × 10-2 | - 5.7 × 10-3 | - 1.2 × 10-2 | 1 | null | $\Delta T_{f} = i \times K_{f} \times m$
$= 4 \times 1.86 \times \frac{0.1}{329 \times 0.1} = 2.3 \times 10^{- 2}$
$\Rightarrow T_{f} = 0 - 2.3 \times 10^{- 2} = - 2.3 \times 10^{- 2}\ ^{\circ}C$ | [] | Chemistry | Physical Chemistry | Moderate | single_correct | false | JEE Main | CH-26 Chemistry Paper 1 15 Jan.docx | |
CH-07-Q20 | $H_{2}O_{2}$is always stored in black bottles because | [] | It is highly unstable | Its enthalpy of decomposition is high | It undergo autooxidation on prolonged standing | None of these | 3 | null | $H_{2}O_{2}$ is unstable liquid and decomposes into water and
oxygen either on standing or on heating. | [] | Chemistry | Inorganic Chemistry | Hydrogen And Its Compound | Easy | single_correct | false | JEE Main | CH-07 Chemistry Paper 17 October.docx |
CH-01-Q15 | The heats of neutralization of four acids a, b, c, and d when
neutralised against a common strong base are 13.7, 9.4, 11.2 and 12.4
kcal respectively. The weakest among base these acids is. | [] | a | b | c | d | null | null | Weaker the acid lesser will be the heat of Neutralisation
∴ Acid is weakest among a, b, c and d | [] | Chemistry | single_correct | false | JEE Main | CH-01 Chemistry Paper 1.docx | |||
CH-17-Q22 | How many spherical balls of radii 2 cm can be placed completely
inside a cubical box of edge = 8 cm ? | [
"images/image69.png"
] | null | 8 | a = 2 × diameter of the ball.
number of balls = 2 × 2 × 2 = 8 | [] | Chemistry | Simple Cubic Structure & BCC | Easy | numerical | true | JEE Main | CH-17 Chemistry Paper 26 Nov. Second.docx | |||||
CH-21-Q4 | To prepare But-2-yne from 2, 2, 3, 3-Tetrachlorobutane, reagent
used is | [] | Zinc dust / $\Delta$ | Sodamide | Alc. KOH | aq. KOH | 1 | null | [
"images/image1.png",
"images/image2.png"
] | Chemistry | Hydrocarbon | Hydrocarbon | Easy | single_correct | true | JEE Main | CH-21 Chemistry Paper 19 Dec. Eng Hindi.docx | |
CH-14-Q25 | Which of the following statement is not true about Mohr's salt | [] | It decolorises [IMAGE] | It is a primary standards | It is a double salt | Oxidation state of iron is +3 in this salt | 3 | null | Oxidation state of iron in mohr's salt | [
"images/image101.png"
] | Chemistry | Inorganic Chemistry | D & F -Block Elements | Easy | single_correct | true | JEE Main | CH-14 Chemistry Paper 7 Nov..docx |
CH-28-Q22 | Which of the following reactions will yield 2,2-dibromopropane ? | [] | ${CH}_{3} - C \equiv CH + 2HBr \longrightarrow$ | ${CH}_{3}CH = CHBr + HBr \longrightarrow$ | $CH \equiv CH + 2HBr \longrightarrow$ | ${CH}_{3} - CH = {CH}_{2} + HBr \longrightarrow$ | 1 | null | [
"images/image11.png"
] | Chemistry | Organic Chemistry | Organic Reaction mechanisms-II | Tough | single_correct | true | JEE Main | CH-28 Chemistry Paper FST 16 Jan.docx | |
CH-12-Q3 | Hexagonal close packing is found in crystal lattice of | [] | Na | Mg | Al | None of these | 2 | null | Co-ordination number in HCP = 12
Co-ordination number in Mg is also = 12 | [] | Chemistry | Physical Chemistry | Moderate | single_correct | false | JEE Main | CH-12 Chemistry Paper 2 Nov..docx | |
CH-05-Q12 | Which resonating structure of 1-Methoxycyclohexa-1,3-diene is
impossible ? | [] | 3 | null | is impossible structure because o-atom does not have 10
electron in its valence shell. | [
"images/image31.png"
] | Chemistry | Organic Chemistry | Some Basic Principles and Techniques | Easy | single_correct | true | JEE Main | CH-05 Chemistry Paper 10 October.docx | ||||
CH-27-Q15 | For the reaction ${SO}_{2(g)} + \frac{1}{2}$
O_2(g)[IMAGE] SO_3(g), if KP = KC (RT)x where the
symbols have usual meaning then the value of x is: (assuming ideality)
vfHkfØ fy,$\ {SO}_{2(g)} + \frac{1}{2}$
O_2(g)[IMAGE] SO_3(g), ds fy, KP = KC(RT)x gksxk]
tgk¡ lHkh çrhd viuk ekurs gq, x | [
"images/image12.png",
"images/image12.png"
] | -1 | $- \frac{1}{2}$ | $\frac{1}{2}$ | 1 | 2 | null | [IMAGE] Δng = - $\frac{1}{2}$ | [
"images/image13.png"
] | Chemistry | Physical Chemistry | Chemical Equilibrium | Moderate | single_correct | true | JEE Main | CH-27 Chemistry Paper 2 15 Jan.docx |
CH-09-Q9 | Which of the following reacts with [IMAGE] to give
phenol? | [
"images/image24.png"
] | 4 | null | [
"images/image29.png"
] | Chemistry | Organic Chemistry | Organic compounds containing Nitrogen | Moderate | single_correct | true | JEE Main | CH-09 Chemistry Paper 26 October.docx | |||||
CH-23-Q20 | Calculate $\Delta_{r}G^{\circ}$ for (NH4CI, s) at 310 K.
Given:$\ \Delta_{r}H^{\circ}$ (NH4CI, s)= -314.5
$\Delta_{r}C_{p} = 0$
$S_{N_{2}(g)}^{o} = 192{JK}^{- 1}{mol}^{- 1}$
$S_{H_{2}(g)}^{\circ} = 130.5{JK}^{- 1}{mol}^{- 1}$
$S_{{Cl}_{2}}^{\circ}(g) = 233{JK}^{- 1}{mol}^{- 1}$
$S^{\circ}{NH}_{4}Cl(s) = 99.5{JK}^{- 1}... | [] | None of these | 1 | null | $\Delta_{r}S^{\circ}\left( {NH}_{4}Cl,s \right)\ at\ 300K$
$= S_{{NH}_{4}Cl(s)}^{\circ} - \left\lbrack \frac{1}{2}S_{N_{2}}^{\circ} + 2S_{H_{2}}^{\circ} + \frac{1}{2}S_{{Cl}_{2}}^{\circ} \right\rbrack$
$= - 374{JK}^{- 1}{mol}^{- 1}$
$\Delta_{f}C_{P} = 0$
$\therefore\Delta_{f}S_{310}^{\circ} = \Delta_{f}S_{300}^{\circ}$... | [] | Chemistry | Inorganic Chemistry | Thermodynamics | Tough | single_correct | false | JEE Main | CH-23 Chemistry Paper 31 Dec. FST.docx | |||
CH-01-Q5 | Which of the following gases will have a greater tendency to get
adsorbed as compared to remaining gases? | [] | O_2 | CO | N_2 | H_2 | null | null | CO because it is polar all other are non polar. | [] | Chemistry | single_correct | false | JEE Main | CH-01 Chemistry Paper 1.docx | |||
CH-12-Q11 | The final step for the extraction of copper from copper pyrite
in Bessemere converter involves the reaction | [] | 4Cu_2 O + FeS → 8Cu + FeSO_4 | Cu_2S + 2Cu_2 O → 6Cu + SO_2 | 2Cu_2 O + FeS → 4Cu + Fe + SO_2 | Cu_2 S + 2FeO → 2Cu + 2FeCO + SO_2 | 2 | null | In Bessemer converter copper sulphide is partially oxidized to
cuprous oxide which further reacts with remaining copper sulphide to
form copper and sulphur dioxide.
Cu_2S + 2Cu_2 O → 6Cu + SO_2 | [] | Chemistry | Inorganic Chemistry | Metallurgy | Moderate | single_correct | false | JEE Main | CH-12 Chemistry Paper 2 Nov..docx |
CH-22-Q10 | Which one of the following substances used in dry cleaning is
abetter strategy to control environmental pollution? | [] | Tetrachloroethylene | Carbon dioxide | Sulphur dioxide | Nitrogen dioxide | 2 | null | The use of carbon dioxide in dry cleaning does not increase
environmental pollution and thus is considered as a better strategy to
control environmental pollution. On the other hand, the substances such
as tetrachloroethylene, sulfur dioxide and nitrogen dioxide on being
used in dry cleaning, pollute the environment be... | [] | Chemistry | Physical Chemistry | Environmental Chemistry | Easy | single_correct | false | JEE Main | CH-22 Chemistry Paper 19 Dec. Eng.docx |
CH-24-Q11 | Densities of diamond and graphite are 3.5 and 2.3 g/mL.
C (diamond) $\rightleftharpoons$ C (graphite) $\Delta$rH = - 1.9
favorable conditions for formation of diamond are | [] | High pressure and low temperature | Low pressure and high temperature | High pressure and high temperature | Low pressure and low temperature | 3 | null | High temperature will favour backward reaction as reaction is
exothermic. While on increasing pressure reaction will shift in
direction higher density. | [] | Chemistry | Physical Chemistry | Chemical Equilibrium | Easy | single_correct | false | JEE Main | CH-24 Chemistry Paper 31 Dec..docx |
CH-04-Q8 | A d-block element has total spin value of +3 or -3 then the
magnetic moment of the element is approximately:
d. +3 -3 | [] | 2.83 B.M. | 3.87 B.M. | 5.9 B.M. (4) 6.93 B.M. | null | 4 | Total spin = 3
[IMAGE] n = 6 n2
i.e. magnetic moment =[IMAGE] = [IMAGE] =
= 3
[IMAGE] n = 6 n2
= [IMAGE] = [IMAGE] = | [
"images/image15.png",
"images/image16.png",
"images/image17.png",
"images/image18.png",
"images/image19.png",
"images/image15.png",
"images/image16.png",
"images/image17.png",
"images/image18.png",
"images/image19.png"
] | Chemistry | Physical Chemistry | Atomic Structure | Moderate | numerical | true | JEE Main | CH-04 Paper 02 Chemistry with Hindi 22-8-2020.docx | |
CH-21-Q16 | Which of the following is a high spin complex ? | [] | $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +}$ | $\left\lbrack Fe(CN)_{6} \right\rbrack^{4 -}$ | $\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}$ | $\left\lbrack {FeF}_{6} \right\rbrack^{3 -}$ | 4 | null | The complex $\left\lbrack {FeF}_{6} \right\rbrack^{4 -}$ is
paramagnetic and uses outer orbital (4d) in hybridisation
$\left( {sp}^{3}d^{2} \right)$; it is thus called as outer orbital or
high spin or spin free complex. So:
$Fe^{24},\lbrack Ar\rbrack 3d^{6}$
[IMAGE] $\mathbf{sp}^{\mathbf{3}}\mathbf{d}^{\mathbf{2}}$hybr... | [
"images/image7.png",
"images/image8.png",
"images/image7.png",
"images/image8.png"
] | Chemistry | Coordination Compounds | Valence Bond Theory and Crystal Field Theory (Part II) | Tough | single_correct | true | JEE Main | CH-21 Chemistry Paper 19 Dec. Eng Hindi.docx |
CH-11-Q14 | Most stable carbanion is | [] | 3 | null | Due to [IMAGE] group in benzene ring,
[IMAGE] is most stable carbanion. | [
"images/image29.png",
"images/image27.png"
] | Chemistry | Organic Chemistry | Organic Chemistry | Easy | single_correct | true | JEE Main | CH-11 Chemistry Paper-2 1Nov New Jee main.docx | ||||
CH-28-Q1 | How many moles of potassium chlorate need to be heated to produce
11.2 liter oxygen at N.T.P. | [] | $\frac{1}{2}$ mol | $\frac{1}{3}$ mol | $\frac{1}{4}$ mol | $\frac{2}{3}$ mol | 2 | null | ${KClO}_{3} \longrightarrow KCl + \frac{3}{2}O_{2}$
$\frac{3}{2}$ mole or 33.6 litre O2 from 1 mole KClO3
11.2 litre of O2 formed by mole KClO3 | [] | Chemistry | Physical Chemistry | Mole concept | Moderate | single_correct | false | JEE Main | CH-28 Chemistry Paper FST 16 Jan.docx |
CH-04-Q2 | Sulphur exist in different allotropic forms like S2, S6 and S8 etc.
If equal moles of these three forms are taken in separate containers,
then the ratio of number of atoms present in them respectively is:, S2, S6 S8
-,
-
(1) 1: 3: 4 (2) 1: 1: 1 (3) 12: 4: 3 (4) 4: 3: 1 | [] | 1: 1: 1 | 12: 4: 3 | 4: 3: 1 | 1 | null | S_2 S_6 S_8
Mole () n n n
Molecule() n × N_A n × N_A n × N_A
Atoms () n × N_A × 2 n × N_A × 6 n × N_A × 8
[IMAGE] Ratio of atoms of S (S ) = 2: 6:
8 = 1: 3 | [
"images/image3.png"
] | Chemistry | Physical Chemistry | Mole Concept | Easy | single_correct | true | JEE Main | CH-04 Paper 02 Chemistry with Hindi 22-8-2020.docx | |
CH-27-Q21 | What will be the product of chlorine water and acetylene | [] | Dichloro propanol | Dichloroethanal | Propanol | 2-Chloroethanal | 2 | null | [
"images/image28.png"
] | Chemistry | Organic Chemistry | Hydrocarbon | Tough | single_correct | true | JEE Main | CH-27 Chemistry Paper 2 15 Jan.docx | |
CH-01-Q13 | Which of the followings represent enantiomer | [] | null | null | [IMAGE] Enantiomer (Every wedge converted into dash & Vice-Versa) | [
"images/image39.png",
"images/image40.png"
] | Chemistry | single_correct | true | JEE Main | CH-01 Chemistry Paper 1.docx | |||||||
CH-27-Q2 | Which of the following chemical reactions depicts the oxidizing
behaviour of H2SO4?
iznf'kZr djrh | [] | 2HI + H2SO4 → I2 + SO2 + 2H2O | Ca(OH)2 + H2SO4 → CaSO4 + 2H2O | NaCl + H2SO4 → NaHSO4 + HCl | 2PCl5 + H2SO4 → 2POCl3 + 2HCl + SO2Cl2 | 1 | null | [
"images/image1.png"
] | Chemistry | Inorganic Chemistry | P-block nitrogen | Moderate | single_correct | true | JEE Main | CH-27 Chemistry Paper 2 15 Jan.docx | |
CH-01-Q23 | The conversion of oxygen to ozone occurs to the extent of 15 only.
The mass of ozone
that can be prepared from 67.2 L of oxygen at STP will be | [] | null | null | [IMAGE] 3 mol
3 - 3 × 15 moles of O_3 = 3 × 15 × 2
[IMAGE] mass of O3 [IMAGE] = 14.4 gm | [
"images/image64.png",
"images/image65.png",
"images/image66.png",
"images/image67.png"
] | Chemistry | single_correct | true | JEE Main | CH-01 Chemistry Paper 1.docx | |||||||
CH-24-Q20 | pH of 0.1 M Na_2HPO_4 and 0.2 M NaH_2PO_4 are respectively:
(pK_a for H_3PO_4 are 2.2, 7.2 and 12) | [] | 4.7, 9.6 | 9.6, 4.7 | 9.3, 4.4 | 4.4, 93 | 2 | null | For Na_2HPO_4, pH =
$\frac{{pK}_{a_{2}} + {pK}_{a_{3}}}{2} = \frac{7.28 + 12}{2} = 9.6$.
For Na_2HPO_4, pH =
$pH = \frac{{pK}_{a_{1}} + {pK}_{a_{2}}}{2} = \frac{2.2 + 7.2}{2} = 4.7$. | [] | Chemistry | Physical Chemistry | Ionic Equilibrium | Easy | single_correct | false | JEE Main | CH-24 Chemistry Paper 31 Dec..docx |
CH-17-Q3 | The correct IUPAC name of following compound is | [
"images/image5.png"
] | Methyl -2-ethylpropanoate | Methyl butane-2-carboxylate | Methyl- 2-methylbutanoate | Methoxypentanone | 3 | null | [IMAGE] Methyl 2 -methylbutanoate | [
"images/image6.png"
] | Chemistry | IUPAC Nomenclature | IUPAC -Nomenclature of chain terminating Functional groups | Easy | single_correct | true | JEE Main | CH-17 Chemistry Paper 26 Nov. Second.docx |
CH-19-Q7 | Which of the following statement is false for trisilylamine? | [] | Three sp2 orbitals are used for s bonding, giving a plane
triangular structure. | The lone pair of electrons occupy a p-orbital at right angles to
the plane triangle and this overlaps with empty p-orbitals on each of
the three silicon atoms resulting in p bonding. | The N-Si bond length is shorter than the expected N-Si bond
length. | It is a weaker Lewis base than trimethyl amine. | 2 | null | There is $p\pi - d\pi$ delocalization of lone pair of electron
on nitrogen atom and empty d-orbital of silicon but not$p\pi - d\pi$,
one of the 2s-orbital electrons jumps to the last Pz orbital and does
not participate in sp2hybridisation. | [
"images/image12.png"
] | Chemistry | Chemical Bonding | Lewis acids, coordinate bond, electrondeficient bond | Moderate | single_correct | true | JEE Main | CH-19 Chemistry Paper 28 Nov. Fourth.docx |
CH-09-Q7 | How many moles of [IMAGE] can be reduced by 1 mole | [
"images/image12.png",
"images/image13.png"
] | 1 | 1 | null | [IMAGE] It is clear from this equation that 3 moles of
[IMAGE] reduce one mole of[IMAGE], hence
1mol. of [IMAGE] will reduce 1/3 moles | [
"images/image14.png",
"images/image13.png",
"images/image15.png",
"images/image13.png",
"images/image15.png"
] | Chemistry | Physical Chemistry | Redox Reaction | Tough | single_correct | true | JEE Main | CH-09 Chemistry Paper 26 October.docx | |||
CH-13-Q19 | With oxalic acid, glycerol at 260º C gives | [] | Allyl alcohol | Glyceryl mono-array oxalate | Formic acid | Glyceraldehyde | 1 | null | [
"images/image30.png"
] | Chemistry | Organic Chemistry | Alcohols, Phenols and Ethers | Moderate | single_correct | true | JEE Main | CH-13 Chemistry Paper 4 Nov..docx | |
CH-09-Q14 | Choose the factor that is responsible for ozone layer depletion. | [] | CFCs | CBrCs | CH_2Br_2 | all are correct | 1 | null | Explanation: Chlorofluorocarbons (CFCs) that are produced by
air conditioners, refrigerators etc. are responsible for ozone layer
depletion. It is also known as Freon and its life in the atmosphere is
about 20 - 100 years. | [] | Chemistry | Inorganic Chemistry | Environmental Chemistry | Easy | single_correct | false | JEE Main | CH-09 Chemistry Paper 26 October.docx |
CH-28-Q12 | In the following benzyl/allyl system R - CH = CH2 and
[IMAGE] (R is alkyl group) Then decreasing order
of inductive effect is | [
"images/image8.png"
] | (CH3)3 C-- > (CH3)2CH-- > CH3CH2 | CH3CH2-- > (CH3)2CH-- > (CH3)3C | (CH3)2CH-- > CH3CH2-- > (CH3)3C | (CH3)3C-- > CH3CH2-- > (CH3)2CH | 1 | null | CH3 group has + I effect, as number of - CH3 group increases
the inductive effect increases. | [] | Chemistry | Organic Chemistry | Organic Chemistry | Moderate | single_correct | true | JEE Main | CH-28 Chemistry Paper FST 16 Jan.docx |
CH-09-Q2 | SnCl_2 a gives a precipitate with a solution of HgCl_2. In this
process HgCl_2 is | [] | Reduced | Oxidized | Converted into a complex compound containing both Sn and Hg | Converted into a chloro complex of Hg | 1 | null | [
"images/image4.png"
] | Chemistry | Physical Chemistry | Redox Reaction | Moderate | single_correct | true | JEE Main | CH-09 Chemistry Paper 26 October.docx | |
CH-08-Q21 | Vant hoff factor of BaCl_2 of conc. 0.01M is 1.98. Percentage
dissociation of BaCl_2 on this conc. Will be | [] | null | 49 | [IMAGE] Initially 1 0 0
After dissociation [IMAGE] Total [IMAGE] For a mole [IMAGE] For 0.01 mole [IMAGE] | [
"images/image22.png",
"images/image23.png",
"images/image24.png",
"images/image25.png",
"images/image26.png",
"images/image27.png",
"images/image28.png"
] | Chemistry | Physical Chemistry | Chemical & Ionic Eqilibrium | Easy | numerical | true | JEE Main | CH-08 Chemistry Paper 23 October.docx | ||||
CH-11-Q9 | Which of the following resonating structures of 1-methoxy-1, 3
-butadiene is least stable | [] | 3 | null | The octets of all atoms are complete in structures (1) and (2).
In structure (4) electron deficiency of positively charged carbon is
duly compensated by lone pair electrons of adjacent oxygen atom while
such neighbour group support is not available in structure (3). | [] | Chemistry | Organic Chemistry | Organic Chemistry | Moderate | single_correct | false | JEE Main | CH-11 Chemistry Paper-2 1Nov New Jee main.docx | ||||
CH-05-Q6 | BaCl_2 + Na_3PO_4[IMAGE] Ba_3(PO_4)_2 + NaCl
Which of the following statement (s) are correct, when 2 mol each of
Na_3PO_4 and BaCl_2 reacts ?
(I) 6 mol NaCl is formed.
(II) 2/3 mol of Ba3(PO_4)_2 is formed.
(III) Na_3PO_4 is Limiting reagent
(IV) 2/3 mol of Na_3PO_4 is left.
(V) BaCl_2 is Limiting reagent. | [
"images/image5.png"
] | I and V | II and III | II, III and IV | II, IV and V
BaCl_2 + Na_3PO_4[IMAGE] Ba_3(PO_4)_2 + NaCl | 4 | null | 3BaCl_2 + 2Na_3PO_4[IMAGE] Ba_3(PO_4)_2 +
6NaCl
$\because$ 3 mol of Basl_2 reacts with 2 mol Na_3PO_4
$\therefore$ 2 mol of BaCl_2 reacts with
$= \frac{2}{3} \times 2 = \frac{4}{3}$ mol Na_3 PO_4
Reacted mol of Na_3PO_4$= \frac{4}{3}$ mol | [
"images/image6.png"
] | Chemistry | Physical Chemistry | Some Basic Concepts of Chemistry | Moderate | single_correct | true | JEE Main | CH-05 Chemistry Paper 10 October.docx |
CH-01-Q16 | The correct order of bond length (C - O) is | [] | CO_2 < CO < CO_3 ^2 | CO_3 ^2- < CO < CO_2 | CO < CO_2 < CO_3 ^2 | CO < CO_3 ^2- < CO_2 | null | null | [IMAGE] Bond Order = 2
[IMAGE] Bond order = 3 | [
"images/image42.png",
"images/image43.png",
"images/image44.png",
"images/image45.png",
"images/image46.png"
] | Chemistry | single_correct | true | JEE Main | CH-01 Chemistry Paper 1.docx | |||
CH-14-Q3 | The electrolytic cells, one containing acidified ferrous chloride
and another acidified ferric chloride are connected in series. The ratio
of iron deposited at cathodes in the two cells when electricity is
passed through the cells will be | [] | 3: 1 | 2: 1 | 1: 1 | 3: 2 | 4 | null | At Ratio of weight of Fe liberated[IMAGE] | [
"images/image9.png",
"images/image10.png",
"images/image11.png"
] | Chemistry | Physical Chemistry | Electrochemistry | Easy | single_correct | true | JEE Main | CH-14 Chemistry Paper 7 Nov..docx |
CH-26-Q12 | Consider the reaction equilibrium
2SO_2 (g) + O_2 (g)[IMAGE] 2SO_3 (g); ΔHº = - 198 kJ.
On the basis of Le Chatelier's principle, the condition favourable for
the forward reaction is | [
"images/image7.png"
] | lowering of temperature as well as pressure | increasing temperature as well as pressure | lowering the temperature and increasing the pressure | any value of temperature and pressure.
fuEu vfHkfØ ij fopkj djks
2SO_2 (g) + O_2 (g)[IMAGE] 2SO_3 (g); ΔHº = - 198 kJ.
gksxh | 3 | null | The conversion of SO2 to SO3 is an exothermic reaction, hence
there is no need to increase the temperature. There is also a decrease
in volume or moles in product side. Thus the reaction is favoured by low
temperature and high pressure. (Le-Chatelier's principle).
c<+kus sbZ ugha gSaA pw¡fd mijksDr
vksj ¼nk¡;h vksj½ ks... | [] | Chemistry | Physical Chemistry | Chemical Equilibrium | Moderate | single_correct | true | JEE Main | CH-26 Chemistry Paper 1 15 Jan.docx |
CH-27-Q30 | 1.22 g of benzoic acid is dissolved in 100 g of acetone and 100
g of benzene separately. Boiling point of the solution in acetone
increases by 0.17ºC, while that of, in the benzene increases by 0.13ºC;
Kb for acetone and benzene is 1.7 K kg mol-1 and 2.6 K kg mol-1. Find
molecular weight of benzoic acid in two cases an... | [] | null | 122 | (i) In first case, çFke voLFkk esa]
$\Delta T_{b} = K_{0} \times m = K_{0} \times \frac{W_{t}\.\ of\ solute\ }{\ Mol.\ wt.\ of\ solute\ } \times \frac{1000}{\ wt.\ of\ solvent\ }$
or $0.17 = 1.7 \times \frac{1.22}{M \times 100 \times 10^{- 3}}$
or M = 122 g/mole
Thus the benzoic acid exists as a monomer in acetone
vr c... | [] | Chemistry | Physical Chemistry | Tough | numerical | false | JEE Main | CH-27 Chemistry Paper 2 15 Jan.docx | |||||
CH-21-Q15 | The crystal field splitting energy for octahedral complex
$\left( \Delta_{0} \right)$ and that for tetrahedral complex
$\left( \Delta_{t} \right)$ are related as:
$\left( \Delta_{t} \right)$ ds fy, fØLVy {ks=k foikVu fuEu izdkj
lEcfU/kr | [] | $\Delta_{t} = \frac{4}{9}\Delta_{0}$ | $\Delta_{t} = 0.5\Delta_{0}$ | $\Delta_{t} = 0.33\Delta_{0}$ | $\Delta_{t} = \frac{9}{4}\Delta_{0}$ | 1 | null | (A) This may attributes to the following two reasons.
(i)There are only four ligands instead of six, so the ligand field is
only two thirds the size; as the ligand field splitting is also the
two thirds the size and (ii) the direction of the orbitals does not
concide with the direction of the ligands. This reduces the ... | [] | Chemistry | Coordination Compounds | Valence Bond Theory and Crystal Field Theory (Part I) | Moderate | single_correct | false | JEE Main | CH-21 Chemistry Paper 19 Dec. Eng Hindi.docx |
CH-18-Q15 | Which one of the following statements is incorrect in relation
to ionisation enthalpy ? | [] | Ionization enthalpy increases for each successive electron. | The greatest increase in ionization enthalpy is experienced on
removal of electron from core of noble gas configuration. | End of valence electrons is marked by a big jump in ionization
enthalpy. | Removal of electron from orbitals bearing lower n value is
easier than from orbitals having higher n value. | 4 | null | Orbitals bearing lower value of n will be more closer to the
nucleus and thus electrons will experience greater attraction from
nucleus and so its removal will be difficult, not easier. | [] | Chemistry | Periodic table | Ionisation energy | Moderate | single_correct | false | JEE Main | CH-18 Chemistry Paper 27 Nov. Third.docx |
CH-25-Q6 | But-2-ene can be obtained by electrolysis of an aqueous solution
of | [] | 2, 3-Dimethyl maleic acid | 2, 2-Dimethyl butanedioic acid | 2,3-Dimethylbutanedioic acid
C;wV-2-bZu | 4 | null | [
"images/image19.png"
] | Chemistry | Organic Chemistry | Hydrocarbon | Moderate | single_correct | true | JEE Main | CH-25 Chemistry Paper 7 Jan.docx | ||
CH-17-Q5 | Select incorrect statement | [] | Red lead is Pb3O4 | (Me)2SiCl2 on hydrolysis and then on subsequent intermolecular
condensation gives cross linked silicones. | SiO44- on hydrolysis with water or acid produces Si2O76 | None | 2 | null | When a compound like CH3SiCl3 undergoes hydrolysis, a complex
cross-linked polymer is obtained as chain can grow in three places as | [
"images/image9.png"
] | Chemistry | P-block | Miscellaneous (Silicones, Silicates, Zeolites & Alums) | Moderate | single_correct | true | JEE Main | CH-17 Chemistry Paper 26 Nov. Second.docx |
CH-12-Q12 | Heating mixture of Cu_2O and Cu_2S will give | [] | Cu + SO_2 | Cu + SO_3 | CuO + CuS | Cu_2 SO_3 | 1 | null | Cu_2 S + 2Cu_2 O → 6Cu + SO_2 (Auto-reduction).
This reaction occurs in reverberatory furnace to get metallic copper. | [] | Chemistry | Inorganic Chemistry | Metallurgy | Easy | single_correct | false | JEE Main | CH-12 Chemistry Paper 2 Nov..docx |
CH-17-Q24 | An ideal solution contains two volatile liquids A (pº = 100
torr) and B (pº = 200 torr). If mixture contain 1 mole of A and 4 mole
of B then total vapour pressure of the distillate is | [] | null | 188.88 | [IMAGE] yA (composition of A in vapour phase) [IMAGE] For condensation
$y_{A} = x_{A}^{1};y_{B} = x_{B}^{1}$
$P_{bal} = P_{A}^{\circ}x_{A}^{1} + P_{B}^{\circ}x_{B}^{1}$
$P_{wal} = 100 \times \frac{1}{9} + \frac{8}{9} \times 200\ \Rightarrow 100 \times \frac{1}{5} + 200 \times \frac{4}{5}$ | [
"images/image79.png",
"images/image80.png",
"images/image81.png"
] | Chemistry | Electrochemistry | Completely miscible liquids : Raoult's law | Moderate | numerical | true | JEE Main | CH-17 Chemistry Paper 26 Nov. Second.docx | ||||
CH-20-Q2 | When the pressure is applied over system ice $\rightleftharpoons$
water what will happen? | [] | More water will form | More ice will form | There will be no effect over equilibrium | Water will decompose in H_2 and O_2 | 1 | null | $\begin{matrix}
Ice \\
more\ volume
\end{matrix} \rightleftharpoons \begin{matrix}
Water \\
less\ volume
\end{matrix}$
On increasing pressure, equilibrium shifts forward. | [] | Chemistry | Physical Chemistry | Chemical equilibrium | Tough | single_correct | false | JEE Main | CH-20 Chemistry Paper 12 Dec..docx |
CH-14-Q5 | The molar conductance of at infinite dilution are 126.45,426.16 and
[IMAGE] respectively. The molar conductance of
[IMAGE] at infinite dilution is | [
"images/image19.png",
"images/image20.png",
"images/image21.png",
"images/image22.png"
] | 2 | null | [
"images/image27.png",
"images/image28.png",
"images/image29.png"
] | Chemistry | Physical Chemistry | Electrochemistry | Moderate | single_correct | true | JEE Main | CH-14 Chemistry Paper 7 Nov..docx | |||||
CH-02-Q1 | The electrode potentials for [IMAGE] and
[IMAGE] are are respectively. The value of [IMAGE] will be | [
"images/image1.png",
"images/image2.png",
"images/image3.png",
"images/image4.png",
"images/image5.png"
] | null | null | [
"images/image10.png",
"images/image11.png",
"images/image12.png",
"images/image13.png",
"images/image14.png"
] | Chemistry | single_correct | true | JEE Main | CH-02 Chemistry paper 2.docx | ||||||||
CH-26-Q17 | How many of the following relations are correct for the
solubility product (Ksp) & solubility (s g/litre) of sparingly soluble
salt A3B2 (producing A2+ & B3- ions; mol. wt. M) in water ?
(Assume no hydrolysis of any ion).
ty esa vYi cukrk M)
lgh gSa (ekuk fd | [] | K_sp = 108s^5 | $K_{sp} = \left\lbrack \frac{3s}{M} \right\rbrack^{3}\left\lbrack \frac{2s}{M} \right\rbrack^{2}$ | $K_{sp} = \left( 3\left\lbrack A^{2 +} \right\rbrack \right)^{3}\left( 2\left\lbrack B^{3 -} \right\rbrack \right)^{2}$ | $\left\lbrack B^{3 -} \right\rbrack = \frac{2s}{M}$ | null | 4 | A3B2 [IMAGE] 3A2+ + 2B3+
KSP = | [
"images/image15.png"
] | Chemistry | Physical Chemistry | Ionic Equilibrium | Tough | numerical | true | JEE Main | CH-26 Chemistry Paper 1 15 Jan.docx |
CH-25-Q19 | A metallic carbide on treatment with water gives a colourless
gas which burns readily in air and gives a precipitate with ammonical
silver nitrate solution. The gas evolved is:
tks fd rsth ls gok | [] | C_5 H_5 | C_6 H_6 | C_2 H_4 | C_2 H_2 | 4 | null | [
"images/image81.png"
] | Chemistry | Organic Chemistry | Hydrocarbon | Moderate | single_correct | true | JEE Main | CH-25 Chemistry Paper 7 Jan.docx | |
CH-16-Q8 | From the given set of species, point out the species from each
set having highest Z_eff
(a) O2-, F-, Na+ (b) Li, Be, Na (c) He, Li+, H-
a b c | [] | Na+ Be Li+ | O2- Li H | F- Na He | Na+ Be He | 1 | null | For isoelectronic species, as Z increases, Z_eff increases
(and vice versa). | [] | Chemistry | Periodic table | Shielding Effect &Z_eff | Moderate | single_correct | false | JEE Main | CH-16 Chemistry Paper 25 Nov. Fisrt.docx |
CH-22-Q17 | Which of the following is a bactericidal antibiotic ? | [] | Erythromycin | Tetracycline | Chloramphenicol | Ofloxacin | 4 | null | Ofloxacin is a bactericidal antibiotic. On the other
hand,erythromycin, tetracycline and chloramphenicol arebacteriostatic
antibiotic. | [] | Chemistry | Organic Chemistry | Chemistry in Everyday life | Moderate | single_correct | false | JEE Main | CH-22 Chemistry Paper 19 Dec. Eng.docx |
CH-08-Q11 | Which of the following pentoses will be optically active | [
"images/image12.png"
] | All | II and III | I | II | 1 | null | All are optically active. | [] | Chemistry | Organic Chemistry | Biomolecules | Moderate | single_correct | true | JEE Main | CH-08 Chemistry Paper 23 October.docx |
CH-15-Q7 | A catalyst increases rate of reaction by | [] | Decreasing enthalpy | Decreasing internal energy | Decreasing activation energy | Increasing activation energy | 3 | null | Catalyst provides new path to the chemical reaction which has
lower value of activation energy. Reactant and product will not be
affected, so there will not be any change in state parameter like
enthalpy and internal energy. | [] | Chemistry | Surface Chemistry | Catalysis | Easy | single_correct | false | JEE Main | CH-15 Chemistry Paper 11 Nov..docx |
CH-07-Q23 | At 400 K, the root mean square (rms) speed of a gas X (molecular
weight = 40) is equal to the most probable speed of gas Y at 60 K. The
molecular weight of the gas Y is | [] | null | null | $\sqrt{\frac{3RT_{1}}{M_{1}}} = \sqrt{\frac{2RT_{2}}{M_{2}}}$
$\sqrt{\frac{3 \times 400}{40}} = \sqrt{\frac{2 \times 60}{x}}$
$30 = \frac{120}{x}$
x = 4 g/mol | [] | Chemistry | Inorganic Chemistry | Gaseous state | Moderate | single_correct | false | JEE Main | CH-07 Chemistry Paper 17 October.docx | ||||
CH-11-Q23 | The oxidation state of Cr in [IMAGE] is | [
"images/image32.png"
] | null | 3 | [
"images/image32.png",
"images/image33.png",
"images/image34.png",
"images/image35.png"
] | Chemistry | Organic Chemistry | Organic Chemistry | Moderate | numerical | true | JEE Main | CH-11 Chemistry Paper-2 1Nov New Jee main.docx | |||||
CH-16-Q2 | The correct IUPAC name of following compound is | [
"images/image8.png"
] | 4-Aminomethyl-3-hydroxycyclohex-5-ene-1-carboxylic acid | 2-Aminomethyl-5-carboxycyclohex-3-en-1-ol | 4-Aminomethyl-5-hydroxycyclohex-2-ene-1-carboxylic acid | 3-Hydroxy-4-aminomethylcyclohex-5-en-1-oic acid | 3 | null | [IMAGE] 4-Aminomethyl-5-hydroxycyclohex-2-ene-1-carboxylic acid | [
"images/image9.png"
] | Chemistry | IUPAC and Structural Isomerism | IUPAC -Nomenclature of chain terminating Functional groups | Moderate | single_correct | true | JEE Main | CH-16 Chemistry Paper 25 Nov. Fisrt.docx |
CH-25-Q29 | The major organic compound formed by the reaction of 1,1,1-
trichloroethane with silver powder is ____-Butyne.
cM+h ek=kk | [] | null | 2 | [
"images/image101.png",
"images/image102.png"
] | Chemistry | Organic Chemistry | Hydrocarbon | Moderate | numerical | true | JEE Main | CH-25 Chemistry Paper 7 Jan.docx | |||||
CH-25-Q13 | Match the reactants in column I with product in column II:
Column I Column II
dkWye I dkWye II
(A) CaC_2 + H_2O (p) CH_3 - C $\equiv$ C - CH_3
(B) Mg_2C_3 + H_2O (q) CH_3 - C $\equiv$ CH
(C) [IMAGE] (r) [IMAGE] (D) [IMAGE] (s) [IMAGE] (E) [IMAGE] (t) CH_3 - CH_3
(F) [IMAGE] (u) I_2CH - CHI_2
(G) [IMAGE] (v) | [
"images/image40.png",
"images/image41.png",
"images/image42.png",
"images/image43.png",
"images/image44.png",
"images/image41.png",
"images/image42.png",
"images/image45.png",
"images/image46.png",
"images/image47.png",
"images/image48.png",
"images/image49.png",
"images/image50.png"
] | (A) - (s) (C) - q (E) - s
(G) - s | (A) - (s) (C) - s (E) - s
(G) - p | (A) - (s) (C) - p (E) - s
(G) - s | (A) - (s) (C) - s (E) - s
(G) - p | 4 | null | (A) CaC_2 + H_2O [IMAGE] Ca(OH)_2 + CH
(B) Mg_2C_3 + H_2O[IMAGE] Mg (OH)_2 + CH_3 | [
"images/image51.png",
"images/image52.png",
"images/image51.png",
"images/image53.png",
"images/image54.png",
"images/image55.png",
"images/image56.png",
"images/image57.png",
"images/image58.png"
] | Chemistry | Organic Chemistry | Hydrocarbon | Tough | single_correct | true | JEE Main | CH-25 Chemistry Paper 7 Jan.docx |
CH-01-Q2 | Which of the following compounds was starting material for the
oxidation shown below? | [
"images/image5.png"
] | null | null | [
"images/image10.jpeg"
] | Chemistry | single_correct | true | JEE Main | CH-01 Chemistry Paper 1.docx | ||||||||
CH-28-Q30 | How many isomeric alkynes on catalytic hydrogenation gives
3-Ethyl-4-methylheptane ? | [] | null | 3 | [
"images/image12.png",
"images/image13.png",
"images/image14.png"
] | Chemistry | Organic Chemistry | Structure Identification & POC | Moderate | numerical | true | JEE Main | CH-28 Chemistry Paper FST 16 Jan.docx | |||||
CH-04-Q20 | The correct order of increasing covalent character is | [] | LiCl, NaCl, BeCl_2 | BeCl_2, NaCl, LiCl
(3) NaCl, LiCl, BeCl_2 | BeCl_2, LiCl, NaCl | null | 3 | According to Fajans' rule,
Covalent character (when anion is same)
[IMAGE] charge of cation
Na and Li have +1 charge while Be has +2 charge. Moreover, the order
of size is Be < Li < Na
Thus, the order of covalent character is BeCl2 > LiCl > NaCl,
[IMAGE]
Na Li +1 Be +2
Be < Li < Na,:
BeCl_2 > LiCl > NaCl | [
"images/image43.png",
"images/image44.png"
] | Chemistry | Physical Chemistry | Chemical Bonding | Moderate | numerical | true | JEE Main | CH-04 Paper 02 Chemistry with Hindi 22-8-2020.docx | |
CH-10-Q4 | In acid solution, the reaction [IMAGE] involves | [
"images/image12.png"
] | Oxidation by 3 electrons | Reduction by 3 electrons | Oxidation by 5 electrons | Reduction by 5 electrons | 4 | null | [IMAGE] In this reaction [IMAGE] are needed for the reduction of [IMAGE] as | [
"images/image13.png",
"images/image14.png",
"images/image15.png",
"images/image16.png"
] | Chemistry | Physical Chemistry | Redox Reaction | Easy | single_correct | true | JEE Main | CH-10 Chemistry Paper-1 30 Oct New Jee main.docx |
CH-26-Q13 | Phosphorus pentachloride dissociates as follows in a closed
reaction vessel.
PCl_5(g) [IMAGE] PCl_3(g) + Cl_2(g)
If total pressure at equilibrium of the reaction mixture is P and
degree of dissociation of PCl_5 is x, the partial pressure of PCl3
will be:
gksrh gS
PCl_5(g) [IMAGE] PCl_3(g) + Cl_2(g)
fn vfHkfØ;k feJ.k ij... | [
"images/image8.png",
"images/image8.png"
] | $\left( \frac{x}{x + 1} \right)P$ | $\left( \frac{2x}{1 - x} \right)P$ | $\left( \frac{x}{x + 1} \right)P$ | $\left( \frac{x}{1 - x} \right)P$ | 1 | null | Given: PCI5 (g)[IMAGE] PCI3(g) + CI2(g)
t = 0 1 0 0
teq 1-x x x
Total number of moles = 1 - x + x + x = 1 + x
Thus partial pressure of PCI3 = $\left( \frac{x}{1 + x} \right)$ P.
fn;k gqvk gS PCI5 (g)[IMAGE] PCI3(g) + CI2(g)
t = 0 1 0 0
teq 1-x x x
dqy = 1 - x + x + x = 1 + x
vr PCI3 = $\left( \frac{x}{1 + x} \right)$ P... | [
"images/image9.png",
"images/image9.png"
] | Chemistry | Physical Chemistry | Chemical Equilibrium | Moderate | single_correct | true | JEE Main | CH-26 Chemistry Paper 1 15 Jan.docx |
End of preview. Expand in Data Studio
JEE Main — Question Bank
A structured dataset of JEE Main examination questions with full metadata, worked solutions, and diagrams. Built for education, ML training, and question-generation use cases.
Subsets:
- Chemistry — 738 questions from 28 papers
- Physics — 768 questions from 28 papers
- Mathematics — 801 questions from 28 papers
Over 2,300 questions across the three core JEE subjects.
Structure
Organised into subsets by subject and splits (train / test):
chemistry/ physics/ mathematics/
├── train.jsonl ├── train.jsonl ├── train.jsonl
├── test.jsonl ├── test.jsonl ├── test.jsonl
└── images/ └── images/ └── images/
Choose the subject from the Subset dropdown and the split from the Split dropdown in the Dataset Viewer.
Schema
| Field | Type | Description |
|---|---|---|
question_id |
string | Unique ID, e.g. CH-14-Q1, P-05-Q1, M-10-Q3. |
question |
string | Question text. [IMAGE] marks where a diagram appears inline. |
question_images |
list[str] | Relative paths to images used in the question. |
option_1…4 |
string | The four answer choices (empty for numerical questions). |
correct_option |
int/null | Index (1–4) of the correct choice for single-correct questions. |
numerical_answer |
str/null | The numeric answer for integer/numerical questions. |
solution |
string | Full worked solution. [IMAGE] marks inline figures. |
solution_images |
list[str] | Relative paths to images used in the solution. |
subject |
string | Chemistry, Physics, or Mathematics. |
topic |
string | e.g. Physical Chemistry, Thermodynamics, Circles. |
subtopic |
string | e.g. Electrochemistry, Cyclic process. |
difficulty |
string | e.g. Easy / Moderate / Tough (where provided). |
question_type |
string | single_correct / numerical. |
has_image |
bool | Whether the question or solution contains a figure. |
exam |
string | JEE Main. |
source_paper |
string | Original source paper reference. |
Images
Original .emf / .wmf vector figures have been converted to PNG and stored
under each subject's images/ folder. Image fields hold relative paths
(e.g. images/image5.png).
Coverage notes
- The large majority of questions include a verified answer key. A small number of the earliest papers were supplied without an answer key and are included for their questions and solutions.
- Topic / subtopic / difficulty metadata is present for most questions where the source paper provided it.
- Questions support both single-correct (4 options) and integer/numerical types.
- Answers are captured across several source conventions (numeric, letter A–D, integer, and answers embedded in the solution line).
Loading
from datasets import load_dataset
chem = load_dataset("eQOURSE/jee-main-questions", "chemistry")
phys = load_dataset("eQOURSE/jee-main-questions", "physics")
math = load_dataset("eQOURSE/jee-main-questions", "mathematics")
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