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yyV2ZybXjY8yaSjjSW1kmiukl04 | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.<br/><br/>(Atomic numbers Ce = 58, Gd = 64 and Eu = 63)<br/><br/>(a) (NH<sub>4</sub>)<sub>2</sub>[Ce(NO<sub>3</sub>)<sub>6</sub>]<br/><br/>(b) Gd(NO<sub>3</sub>)<sub>3</sub> and <b... | [{"identifier": "A", "content": "(a) < (b) < (c)"}, {"identifier": "B", "content": "(b) < (a) < (c)"}, {"identifier": "C", "content": "(a) < (c) < (b)"}, {"identifier": "D", "content": "(c) < (a) < (b)"}] | ["C"] | null | <p>(A) $${}_{58}Ce \to [Xe]4{f^2}5{d^0}6{s^2}$$</p>
<p>In complex $$C{e^{ + 4}} \to [Xe]4{f^0}5{d^0}6{s^0}$$</p>
<p>There is no unpaired electron, so, $$\mu$$<sub>m</sub> = 0 BM</p>
<p>(B) $${}_{64}Gd \to [Xe]4{f^7}5{d^1}6{s^2}$$</p>
<p>In complex, $${}_{64}G{d^{2 + }} \to [Xe]4{f^7}5{d^1}$$</p>
<p>There are 8 unpaired... | mcq | jee-main-2021-online-16th-march-evening-shift | 1,837 |
1krxbxmjk | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | Number of electrons present in 4f orbital of Ho<sup>3+</sup> ion is ____________. (Given Atomic No. of Ho = 67) | [] | null | 10 | Ho = [Xe]4f<sup>11</sup>6s<sup>2</sup><br><br>Ho<sup>3+</sup> = [Xe] 4f<sup>10</sup><br><br>So number of e<sup>$$-$$</sup> present in 4f is 10. | integer | jee-main-2021-online-25th-july-evening-shift | 1,838 |
1ktb63hda | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | The number of 4f electrons in the ground statement electronic configuration of Gd<sup>2+</sup> is ___________. [Atomic number of Gd = 64] | [] | null | 7 | The electronic configuration of <br><br>$$_{64}Gd:[Xe]4{f^7}5{d^1}6{s^2}$$<br><br>So, the electronic configuration of <br><br>$$_{64}G{d^{2 + }}:[Xe]4{f^7}5{d^1}6{s^0}$$<br><br>i.e. the number of 4f electrons in the ground state electronic configuration of $$G{d^{2 + }}$$ is 7. | integer | jee-main-2021-online-26th-august-morning-shift | 1,839 |
1ktee7inf | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | The number of f electrons in the ground state electronic configuration of Np (Z = 93) is ___________. (Nearest integer) | [] | null | 18 | Np = 1s<sup>2</sup> 2<sup>2</sup> 2p<sup>6</sup> 3s<sup>2</sup> 3p<sup>6</sup> 4s<sup>2</sup> 3d<sup>10</sup> 4p<sup>6</sup> 5s<sup>2</sup> 4d<sup>10</sup> 5p<sup>6</sup> 6s<sup>2</sup><br><br>4f<sup>14</sup> 5d<sup>10</sup> 6p<sup>6</sup> 7s<sup>2</sup> 5f<sup>4</sup> 6d<sup>1</sup><br><br>Total No. of 'f' electron = ... | integer | jee-main-2021-online-27th-august-morning-shift | 1,840 |
1ktiado5m | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58) | [{"identifier": "A", "content": "Nd"}, {"identifier": "B", "content": "Yb"}, {"identifier": "C", "content": "La"}, {"identifier": "D", "content": "Ce"}] | ["B"] | null | Yb (70) = 4f<sup>14</sup> 6s<sup>2</sup>
<br><br>Yb<sup>+2</sup> = 4f<sup>14</sup> 6s<sup>0</sup>
<br><br>$$ \because $$ All the electrons are paired hence Yb<sup>+2</sup> is
diamagnetic. | mcq | jee-main-2021-online-31st-august-morning-shift | 1,841 |
1ktjuwuhj | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | The Eu<sup>2+</sup> ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63] | [{"identifier": "A", "content": "4f<sup>7</sup>6s<sup>2</sup>"}, {"identifier": "B", "content": "4f<sup>6</sup>"}, {"identifier": "C", "content": "4f<sup>7</sup>"}, {"identifier": "D", "content": "4f<sup>6</sup>6s<sup>2</sup>"}] | ["C"] | null | Eu $$\to$$ [Xe]4f<sup>7</sup>6s<sup>2</sup><br><br>Eu<sup>2+</sup> $$\to$$ [Xe]4f<sup>7</sup> | mcq | jee-main-2021-online-31st-august-evening-shift | 1,842 |
1l56auy63 | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Which one of the lanthanoids given below is the most stable in divalent form?</p> | [{"identifier": "A", "content": "Ce (Atomic Number 58)"}, {"identifier": "B", "content": "Sm (Atomic number 62)"}, {"identifier": "C", "content": "Eu (Atomic Number 63)"}, {"identifier": "D", "content": "Yb (Atomic Number 70)"}] | ["C"] | null | <p>The stability of a divalent state can often be attributed to the stability of the electron configuration of that state. Among the options given, we can evaluate the electron configurations of each element in their divalent state to find out which is the most stable. The electronic configurations of the neutral atoms... | mcq | jee-main-2022-online-28th-june-morning-shift | 1,843 |
1l56xmd5o | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | The 'f' orbitals are half and completely filled, respectively in lanthanide ions :
<p>[Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]</p> | [{"identifier": "A", "content": "Eu<sup>2+</sup> and Tm<sup>2+</sup>"}, {"identifier": "B", "content": "Sm<sup>2+</sup> and Tm<sup>3+</sup>"}, {"identifier": "C", "content": "Tb<sup>4+</sup> and Yb<sup>2+</sup>"}, {"identifier": "D", "content": "Dy<sup>3+</sup> and Yb<sup>3+</sup>"}] | ["C"] | null | Tb $$ \to $$ 4f<sup>9</sup> 6s<sup>2</sup><br/><br/>
Tb<sup>+4</sup> $$ \to $$ 4f<sup>7</sup><br/><br/>
Yb $$ \to $$ 4f<sup>14</sup> 6s<sup>2</sup><br/><br/>
Yb<sup>+2</sup> $$ \to $$ 4f<sup>14</sup><br/><br/>
Hence, the pair Tb<sup>+4</sup> and Yb<sup>+2</sup> have half filled and
completely filled f subshells respect... | mcq | jee-main-2022-online-27th-june-evening-shift | 1,844 |
1l5alz4ou | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?</p> | [{"identifier": "A", "content": "It will not prefer to undergo redox reactions."}, {"identifier": "B", "content": "It will prefer to gain electron and act as an oxidizing agent."}, {"identifier": "C", "content": "It will prefer to give away an electron and behave as reducing agent."}, {"identifier": "D", "content": "It... | ["B"] | null | Cerium exists in two different oxidation state $$+3$$, $$+4$$<br/><br/>
$$
\begin{array}{ll}
\mathrm{Ce}^{+4}+\mathrm{e}^{-} \rightarrow \mathrm{Ce}^{3+} & \mathrm{E}^{0}=+1.61 \mathrm{~V} \\
\mathrm{Ce}^{+3}+3 \mathrm{e}^{-} \rightarrow \mathrm{Ce} & \mathrm{E}^{0}=-2.336 \mathrm{~V}
\end{array}
$$<br/><br/>
It shows ... | mcq | jee-main-2022-online-25th-june-morning-shift | 1,846 |
1l6nweoow | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Which of the following pair is not isoelectronic species?</p>
<p>(At. no. Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69)</p> | [{"identifier": "A", "content": "$$\\mathrm{Sm}^{2+}$$ and $$\\mathrm{Er}^{3+}$$"}, {"identifier": "B", "content": "$$\\mathrm{Yb}^{2+}$$ and $$\\mathrm{Lu}^{3+}$$"}, {"identifier": "C", "content": "$$\\mathrm{Eu}^{2+}$$ and $$\\mathrm{Tb}^{4+}$$"}, {"identifier": "D", "content": "$$\\mathrm{Tb}^{2+}$$ and $$\\mathrm{T... | null | null | Species having same number of electrons are isoelectronic <br/><br/>$\left.\begin{array}{l}\mathrm{Tb} \longrightarrow 65 \mathrm{~Tb}^{+2} \longrightarrow 63 \text { electrons } \\ \mathrm{Tm} \longrightarrow 69 ~\mathrm{Tm}^{+4} \longrightarrow 65 \text { electrons }\end{array}\right\}$ not isoelectronic <br/><br/>$\... | mcqm | jee-main-2022-online-28th-july-evening-shift | 1,847 |
1ldwutc9l | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Which one amongst the following are good oxidizing agents?</p>
<p>A. Sm$$^{2+}$$</p>
<p>B. Ce$$^{2+}$$</p>
<p>C. Ce$$^{4+}$$</p>
<p>D. Tb$$^{4+}$$</p>
<p>Choose the most appropriate answer from the options given below :</p> | [{"identifier": "A", "content": "C and D only"}, {"identifier": "B", "content": "A and B only"}, {"identifier": "C", "content": "D only"}, {"identifier": "D", "content": "C only"}] | ["A"] | null | The most appropriate answer is $C$ and $D$ only. $Ce^{4+}$ and $Tb^{4+}$ are good oxidizing agents because they have a high oxidation state and a strong tendency to gain electrons. $Sm^{2+}$ and $Ce^{2+}$ are reducing agents because they have a low oxidation state and a tendency to lose electrons. | mcq | jee-main-2023-online-24th-january-evening-shift | 1,848 |
1lgrkkssk | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Given below are two statement: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$</p>
<p>Assertion A: $$5 \mathrm{f}$$ electrons can participate in bonding to a far greater extent than $$4 \mathrm{f}$$ electrons</p>
<p>Reason R: $$5 \mathrm{f}$$ orbitals are not as buried ... | [{"identifier": "A", "content": "Both A and R are true and R is the correct explanation of A"}, {"identifier": "B", "content": "Both A and R are true but R is NOT the correct explanation of A"}, {"identifier": "C", "content": "A is true but R is false"}, {"identifier": "D", "content": "A is false but R is true"}] | ["A"] | null | <p><b>Assertion A</b>: 5f electrons can participate in bonding to a far greater extent than 4f electrons</p>
<p>This is correct. In actinides (elements in which 5f orbitals are being filled), the 5f electrons can participate in bonding. This contrasts with lanthanides (elements in which 4f orbitals are being filled), w... | mcq | jee-main-2023-online-12th-april-morning-shift | 1,850 |
1lh29chdj | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Strong reducing and oxidizing agents among the following, respectively, are :</p> | [{"identifier": "A", "content": "$$\\mathrm{Ce}^{4+}$$ and $$\\mathrm{Eu}^{2+}$$"}, {"identifier": "B", "content": "$$\\mathrm{Eu}^{2+}$$ and $$\\mathrm{Ce}^{4+}$$"}, {"identifier": "C", "content": "$$\\mathrm{Ce}^{4+}$$ and $$\\mathrm{Tb}^{4+}$$"}, {"identifier": "D", "content": "$$\\mathrm{Ce}^{3+}$$ and $$\\mathrm{C... | ["B"] | null | <p>Strong reducing agents are those that readily donate electrons, and strong oxidizing agents are those that readily accept electrons.</p>
<ul>
<li>$\mathrm{Ce}^{4+}$: It can accept an electron to form $\mathrm{Ce}^{3+}$, so it is a strong oxidizing agent.</li><br/>
<li>$\mathrm{Eu}^{2+}$: It can donate an electron to... | mcq | jee-main-2023-online-6th-april-morning-shift | 1,851 |
jaoe38c1lsc68b7k | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>The electronic configuration for Neodymium is:</p>
<p>[Atomic Number for Neodymium 60]</p> | [{"identifier": "A", "content": "$$[\\mathrm{Xe}] 4 \\mathrm{f}^4 6 \\mathrm{~s}^2$$\n"}, {"identifier": "B", "content": "$$[\\mathrm{Xe}] 5 \\mathrm{f}^4 7 \\mathrm{~s}^2$$\n"}, {"identifier": "C", "content": "$$[\\mathrm{Xe}] 4 \\mathrm{f}^6 6 \\mathrm{~s}^2$$\n"}, {"identifier": "D", "content": "$$[\\mathrm{Xe}] 4 \... | ["A"] | null | <p>The electronic configuration of an element is determined by adding electrons to atomic orbitals following the Aufbau principle, the Pauli exclusion principle, and Hund's rule. For atoms with atomic numbers higher than that of xenon (Xe, atomic number 54), the electrons start filling the outer orbitals following the ... | mcq | jee-main-2024-online-27th-january-morning-shift | 1,852 |
jaoe38c1lscscn43 | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Total number of ions from the following with noble gas configuration is _________.<br/><br/> $$\mathrm{Sr}^{2+}(z=38), \mathrm{Cs}^{+}(z=55), \mathrm{La}^{2+}(z=57), \mathrm{Pb}^{2+}(z=82), \mathrm{Yb}^{2+}(z=70)$$ and $$\mathrm{Fe}^{2+}(z=26)$$</p> | [] | null | 2 | <p>To determine which of these ions have a noble gas configuration, we must consider what the phrase "noble gas configuration" means. Atoms or ions with a noble gas configuration have completely filled electron shells, similar to the electron configuration of the noble gases, which are the elements found in Group 18 of... | integer | jee-main-2024-online-27th-january-evening-shift | 1,854 |
jaoe38c1lsfmj26w | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Which of the following acts as a strong reducing agent? (Atomic number: $$\mathrm{Ce}=58, \mathrm{Eu}=63, \mathrm{Gd}=64, \mathrm{Lu}=71$$)</p> | [{"identifier": "A", "content": "$$\\mathrm{Eu}^{2+}$$\n"}, {"identifier": "B", "content": "$$\\mathrm{Gd}^{3+}$$\n"}, {"identifier": "C", "content": "$$\\mathrm{Lu}^{3+}$$\n"}, {"identifier": "D", "content": "$$\\mathrm{Ce}^{4+}$$"}] | ["A"] | null | $\mathrm{Eu}^{2+}$ is a strong reducing agent changing to the common +3 state while all other are provided at their higher oxidation states. | mcq | jee-main-2024-online-29th-january-evening-shift | 1,855 |
1lsgyc3vg | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Diamagnetic Lanthanoid ions are :</p> | [{"identifier": "A", "content": "$$\\mathrm{La}^{3+} \\& \\mathrm{~Ce}^{4+}$$\n"}, {"identifier": "B", "content": "$$\\mathrm{Nd}^{3+} \\& \\mathrm{~Ce}^{4+}$$\n"}, {"identifier": "C", "content": "$$\\mathrm{Lu}^{3+} \\& \\mathrm{~Eu}^{3+}$$\n"}, {"identifier": "D", "content": "$$\\mathrm{Nd}^{3+} \\& \\mathrm{~Eu}^{3+... | ["A"] | null | <p>$$\mathrm{Ce}:[\mathrm{Xe}] 4 \mathrm{f}^1 5 \mathrm{~d}^1 6 \mathrm{~s}^2 ; \mathrm{Ce}^{4+}$$ diamagnetic</p>
<p>$$\mathrm{La}:[\mathrm{Xe}] 4 \mathrm{f}^0 5 \mathrm{~d}^1 6 \mathrm{~s}^2 ; \mathrm{La}^{3+}$$ diamagnetic</p> | mcq | jee-main-2024-online-30th-january-morning-shift | 1,856 |
luxwda65 | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>The electronic configuration of Einsteinium is :</p>
<p>(Given atomic number of Einsteinium $$=99$$)</p> | [{"identifier": "A", "content": "$$[\\mathrm{Rn}] 5 \\mathrm{f}^{13} 6 \\mathrm{~d}^{\\circ} 7 \\mathrm{~s}^2$$\n"}, {"identifier": "B", "content": "$$[\\mathrm{Rn}] 5 \\mathrm{f}^{12} 6 \\mathrm{~d}^{\\circ} 7 \\mathrm{~s}^2$$\n"}, {"identifier": "C", "content": "$$[\\mathrm{Rn}] 5 \\mathrm{f}^{11} 6 \\mathrm{~d}^{\\c... | ["C"] | null | <p>The correct option for the electronic configuration of Einsteinium (atomic number 99) is:</p>
<strong>Option C: [Rn] 5f<sup>11</sup> 6d<sup>0</sup> 7s<sup>2</sup></strong>
<p>Here's why:</p>
<ol>
<li><strong>Atomic Number and Electrons:</strong> Einsteinium has an atomic number of 99, which means it has 99 proton... | mcq | jee-main-2024-online-9th-april-evening-shift | 1,857 |
luz2ux2a | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>Number of colourless lanthanoid ions among the following is __________.</p> <p>$$\mathrm{Eu}^{3+}, \mathrm{Lu}^{3+}, \mathrm{Nd}^{3+}, \mathrm{La}^{3+}, \mathrm{Sm}^{3+}$$</p> | [] | null | 2 | <p>The color of lanthanoid ions in solutions is mainly due to the electronic transitions within the 4f subshell. The lanthanoid ions are more likely to be colorless when they have fully filled (with 14 electrons) or completely empty (with 0 electrons) f orbitals because, in these cases, there are no electrons to underg... | integer | jee-main-2024-online-9th-april-morning-shift | 1,858 |
lvc583a5 | chemistry | d-and-f-block-elements | inner-transition-elements-(lanthanoids-and-actinoids) | <p>The number of element from the following that do not belong to lanthanoids is $$\mathrm{Eu}, \mathrm{Cm}, \mathrm{Er}, \mathrm{Tb}, \mathrm{Yb}$$ and $$\mathrm{Lu}$$</p> | [{"identifier": "A", "content": "3"}, {"identifier": "B", "content": "1"}, {"identifier": "C", "content": "4"}, {"identifier": "D", "content": "5"}] | ["B"] | null | <p>To determine the number of elements from the given list that do not belong to the lanthanoids, let's first define what lanthanoids are. The lanthanoids consist of the 15 chemical elements in the periodic table from Lanthanum ($\mathrm{La}$) with atomic number 57 to Lutetium ($\mathrm{Lu}$) with atomic number 71. Thu... | mcq | jee-main-2024-online-6th-april-morning-shift | 1,859 |
c9CfP11DD59HCuJp | chemistry | d-and-f-block-elements | properties-of-transition-elements | Which of the following ions has the maximum magnetic moment? | [{"identifier": "A", "content": "Mn<sup>2+</sup>"}, {"identifier": "B", "content": "Fe<sup>2+</sup>"}, {"identifier": "C", "content": "Ti<sup>2+</sup>"}, {"identifier": "D", "content": "Cr<sup>2+</sup>"}] | ["A"] | null | $$M{n^{ + + }} - 5\,\,$$ unpaired electrons
<br><br>$$F{e^{ + + }} - 4\,\,$$ unpaired electrons
<br><br>$$T{i^{ + + }}$$$$ - 2\,\,$$ unpaired electrons
<br><br>$$C{r^{ + + }} - 4\,\,$$ unpaired electrons
<br><br>hence maximum no. of unpaired electron is present in $$M{n^{ + + }}.$$
<br><br><b>NOTE :</b> Magnetic... | mcq | aieee-2002 | 1,860 |
5JCcajI2355RhPMV | chemistry | d-and-f-block-elements | properties-of-transition-elements | For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass
over a liquid metal which does not solidify before glass. The metal used can be : | [{"identifier": "A", "content": "tin"}, {"identifier": "B", "content": "sodium"}, {"identifier": "C", "content": "magnesium"}, {"identifier": "D", "content": "mercury"}] | ["D"] | null | It is mercury because it exists as liquid at room temperature. | mcq | aieee-2003 | 1,861 |
hGEtNUeb5K39R755 | chemistry | d-and-f-block-elements | properties-of-transition-elements | The number of d-electrons retained in Fe<sup>2+</sup> (At no of Fe = 26) ion is : | [{"identifier": "A", "content": "4"}, {"identifier": "B", "content": "5"}, {"identifier": "C", "content": "6"}, {"identifier": "D", "content": "3"}] | ["C"] | null | Fe (Z = 26) $$\to$$ e<sup>-</sup> = 26<br><br>
Fe<sup>2+</sup> (Z = 26) $$\to$$ e<sup>-</sup> = 24<br><br>
Electronic configuration:<br><br>
Fe (Z = 26) $$\to$$ 1s<sup>2</sup> 2s<sup>2</sup> 2p<sup>6</sup> 3s<sup>2</sup> 3p<sup>6</sup> 3d<sup>6</sup> 4s<sup>2</sup><br><br>
Fe<sup>2+</sup> (Z = 26) $$\to$$ 1s<sup>2</su... | mcq | aieee-2003 | 1,862 |
D020DFkDCUuyNIUy | chemistry | d-and-f-block-elements | properties-of-transition-elements | A red solid is insolvable in water. However it becomes soluble if some $$K{\rm I}$$ is added to water. Heating the red solid in a test tube results in liberation of some violet colored fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is : | [{"identifier": "A", "content": "$$Hg{{\\rm I}_2}$$ "}, {"identifier": "B", "content": "$$HgO$$ "}, {"identifier": "C", "content": "$$P{b_3}{O_4}$$ "}, {"identifier": "D", "content": "$${\\left( {N{H_4}} \\right)_2}C{r_2}{O_7}$$ "}] | ["A"] | null | When $$K{\rm I}$$ is added to mercuric iodide it dissolve in it and form complex.
<br><br>$$\mathop {Hg{{\rm I}_2}}\limits_{red,solid(inso{\mathop{\rm lub}} le)} \,\, + \,\,\,K{\rm I} \to \mathop {{K_2}\left[ {Hg{{\rm I}_4}} \right]}\limits_{(soluble)} $$
<br><br>On heating $$Hg{{\rm I}_2}$$ decomposes as
<br><br>$$... | mcq | aieee-2003 | 1,863 |
VSob9iz7js68bxWY | chemistry | d-and-f-block-elements | properties-of-transition-elements | The atomic numbers of vanadium (V), Chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionization enthalpy? | [{"identifier": "A", "content": "Cr"}, {"identifier": "B", "content": "Mn"}, {"identifier": "C", "content": "Fe"}, {"identifier": "D", "content": "V"}] | ["A"] | null | <p>Due to stable electronic configuration of Cr<sup>+1</sup> ion (3d<sup>5</sup>)</p> | mcq | aieee-2003 | 1,865 |
ma733DAZrAFJUpsP | chemistry | d-and-f-block-elements | properties-of-transition-elements | Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them? | [{"identifier": "A", "content": "$$\\left( {n - 1} \\right){d^3}n{s^2}$$ "}, {"identifier": "B", "content": "$$\\left( {n - 1} \\right){d^5}n{s^1}$$ "}, {"identifier": "C", "content": "$$\\left( {n - 1} \\right){d^8}n{s^2}$$ "}, {"identifier": "D", "content": "$$\\left( {n - 1} \\right){d^5}n{s^2}$$ "}] | ["D"] | null | $$\left( {n - 1} \right){d^5}n{s^2}\,\,$$ attains the maximum $$O.S.$$ of $$+7$$ | mcq | aieee-2004 | 1,866 |
ZG09M74QnL8XaH55 | chemistry | d-and-f-block-elements | properties-of-transition-elements | On heating mixture of $$C{u_2}O$$ and $$C{u_2}S$$ will give : | [{"identifier": "A", "content": "$$C{u_2}S{O_3}$$ "}, {"identifier": "B", "content": "$$CuO + CuS$$ "}, {"identifier": "C", "content": "$$Cu + S{O_3}$$"}, {"identifier": "D", "content": "$$Cu + S{O_2}$$ "}] | ["D"] | null | $$2C{u_2}O + C{u_2}S\buildrel \, \over
\longrightarrow 6Cu + S{O_2}$$ self reduction
| mcq | aieee-2005 | 1,867 |
WNl4yt1lk4CGgbeG | chemistry | d-and-f-block-elements | properties-of-transition-elements | The “spin-only” magnetic moment [in units of Bohr magneton, (µ<sub>B</sub>)] of Ni<sup>2+</sup> in aqueous solution would
be : (Atomic number of Ni = 28) | [{"identifier": "A", "content": "2.84"}, {"identifier": "B", "content": "4.90"}, {"identifier": "C", "content": "0 "}, {"identifier": "D", "content": "1.73"}] | ["A"] | null | The number of unpaired electrons in $$N{i^{2 + }}\left( {aq} \right) = 2$$
<br><br>Water is weak ligand hence no pairing will take place spin magnetic moment
<br><br>$$\eqalign{
& = \sqrt {n\left( {n + 2} \right)} = \sqrt {2\left( {2 + 2} \right)} \cr
& = \sqrt 8 = 2.82 \cr} $$ | mcq | aieee-2006 | 1,869 |
n6iax5V3UOLwVYDX | chemistry | d-and-f-block-elements | properties-of-transition-elements | A metal, $$M$$ forms chlorides in its $$+2$$ and $$+4$$ oxidation states. Which of the following statements about these chlorides is correct? | [{"identifier": "A", "content": "$$MC{l_2}$$ is more ionic than $$MC{l_4}$$"}, {"identifier": "B", "content": "$$MC{l_2}$$ is more easily hydrolysed than $$MC{l_4}$$ "}, {"identifier": "C", "content": "$$MC{l_2}$$ is more volatile than $$MC{l_4}$$"}, {"identifier": "D", "content": "$$MC{l_2}$$ is more soluble in anhy... | ["A"] | null | Metal atom in the lower oxidation state forms the ionic bond and in the higher oxidation state the covalent bond. Because higher oxidation state means small size and great polarizing power and hence greater the covalent character. Hence $$MC{l_2}$$ is more ionic than $$MC{l_4}.$$ | mcq | aieee-2006 | 1,870 |
1Veu1FbftW8jrnlq | chemistry | d-and-f-block-elements | properties-of-transition-elements | Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect? | [{"identifier": "A", "content": "Ferrous oxide is more basic in nature than the ferric oxide"}, {"identifier": "B", "content": "Ferrous compounds are relatively more ionic than the corresponding ferric compounds"}, {"identifier": "C", "content": "Ferrous compounds are less volatile than the corresponding ferric compoun... | ["D"] | null | $$F{e^{3 + }}$$ is easily hydrolysed than $$F{e^{2 + }}$$ due to more positive charge. | mcq | aieee-2012 | 1,872 |
ZEn7ZcaWUGRdcXzd | chemistry | d-and-f-block-elements | properties-of-transition-elements | Which of the following arrangements does not represent the correct order of the property stated against it? | [{"identifier": "A", "content": "Ni<sup>2+</sup> < Co<sup>2+</sup> < Fe<sup>2+</sup> < Mn<sup>2+</sup> : ionic size "}, {"identifier": "B", "content": "Co<sup>3+</sup> < Fe<sup>3+</sup> < Cr<sup>3+</sup> < Sc<sup>3+</sup> : stability in aqueous solution "}, {"identifier": "C", "content": "Sc < Ti &... | ["D"] | null | <b>(1)</b>
<br><br><style type="text/css">
.tg {border-collapse:collapse;border-spacing:0;}
.tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;}
.tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:nor... | mcq | jee-main-2013-offline | 1,873 |
uw6OJOAmba4vPAyR | chemistry | d-and-f-block-elements | properties-of-transition-elements | Four successive members of the first row transition elements are listed below with atomic numbers. Which
one of them is expected to have the highest $$E_{{M^{3 + }}/{M^{2 + }}}^0$$ value? | [{"identifier": "A", "content": "Mn (Z = 25)"}, {"identifier": "B", "content": "Fe (Z = 26) "}, {"identifier": "C", "content": "Co (Z = 27) "}, {"identifier": "D", "content": "Cr (Z = 24) "}] | ["C"] | null | <img class="question-image" src="https://res.cloudinary.com/dckxllbjy/image/upload/v1734267768/exam_images/zhbumshr9cvze9ihx6g0.webp" loading="lazy" alt="JEE Main 2013 (Offline) Chemistry - d and f Block Elements Question 179 English Explanation"> | mcq | jee-main-2013-offline | 1,874 |
GtFJfnzqReh9jFJu | chemistry | d-and-f-block-elements | properties-of-transition-elements | Which series of reactions correctly represents chemical relations related to iron and its compound? | [{"identifier": "A", "content": "Fe $$\\buildrel {dil.\\,{H_2}S{O_4}} \\over\n \\longrightarrow $$ FeSO<sub>4</sub> $$\\buildrel {{H_2}S{O_4},{O_2}} \\over\n \\longrightarrow $$ Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> $$\\buildrel {heat} \\over\n \\longrightarrow $$ Fe"}, {"identifier": "B", "content": "Fe $$\\build... | ["D"] | null | In equation
<br><br>(i) $$\,\,\,$$ $$F{e_2}{\left( {S{O_4}} \right)_3}\,\,\,$$
<br><br>and in equation
<br><br>(ii) $$\,\,\,$$ $$F{e_2}{\left( {S{O_4}} \right)_3}$$
<br><br>on decomposing will form oxide instead of $$Fe.$$
<br><br>The correct sequence of reactions is
<br><br>$$Fe\buildrel {{O_2},heat} \over
\lo... | mcq | jee-main-2014-offline | 1,875 |
xkWSCELBONRsag68 | chemistry | d-and-f-block-elements | properties-of-transition-elements | Match the catalysts to the correct processes :
<br/><br/><style type="text/css">
.tg {border-collapse:collapse;border-spacing:0;border:none;border-color:#999;}
.tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:0px;overflow:hidden;word-break:normal;border-color:#999;co... | [{"identifier": "A", "content": "$$\\left( A \\right) - \\left( {ii} \\right),\\,\\,\\left( B \\right) - \\left( {iii} \\right),\\,\\,\\left( C \\right) - \\left( {iv} \\right),\\,\\,\\left( D \\right) - \\left( i \\right)$$ "}, {"identifier": "B", "content": "$$\\left( A \\right) - \\left( {iii} \\right),\\,\\,\\left(... | ["D"] | null | <p>To match the catalysts to the correct processes :</p>
<ol>
<li><p>$TiCl_3$ is well-known as a catalyst in Ziegler-Natta polymerization which is used for the production of polymers of olefins. So, $(A) - (ii)$.</p>
</li>
<br/><li><p>$PdCl_2$ is used in the Wacker process, which is used to convert ethene to acetaldehy... | mcq | jee-main-2015-offline | 1,876 |
0bI33Q8gRyRyHAmOSTCH3 | chemistry | d-and-f-block-elements | properties-of-transition-elements | The transition metal ions responsible for color in ruby and emerald are,
respectively : | [{"identifier": "A", "content": "Cr<sup>3+</sup> and Co<sup>3+</sup>"}, {"identifier": "B", "content": "Co<sup>3+</sup> and Cr<sup>3+</sup>"}, {"identifier": "C", "content": "Co<sup>3+</sup> and Co<sup>3+</sup>"}, {"identifier": "D", "content":... | ["D"] | null | <p>On addition of impurities to the colourless gemstones, brilliant colours are produced. On addition of chromium to colourless corundum (Al<sub>2</sub>O<sub>3</sub>), a red ruby is formed. Red colour ruby is obtained when Cr<sup>3+</sup> ions replace Al<sup>3+</sup> ions in the octahedral sites of corundum. A green em... | mcq | jee-main-2016-online-10th-april-morning-slot | 1,877 |
7GAS0vqEQNgjTXsvn3fQP | chemistry | d-and-f-block-elements | properties-of-transition-elements | Which one of the following species is stable in aqueous solution? | [{"identifier": "A", "content": "Cr<sup>2+</sup>"}, {"identifier": "B", "content": "Cu<sup>+</sup>"}, {"identifier": "C", "content": "MnO$$_4^{3 - }$$"}, {"identifier": "D", "content": "MnO$$_4^{2 - }$$"}] | ["D"] | null | <p>MnO<sub>4</sub><sup>2−</sup> disproportionate as (in neutral or acidic solution)</p>
<p> 3MnO<sub>4</sub><sup>2−</sup> + 4H<sup>+</sup> → 2MnO<sub>4</sub><sup>2−</sup> + MnO<sub>2</sub> + 2H<sub>2</sub>O </p> | mcq | jee-main-2016-online-9th-april-morning-slot | 1,878 |
qyoOw2xejgRXvsZR | chemistry | d-and-f-block-elements | properties-of-transition-elements | Which of the following compounds is metallic and ferromagnetic ? | [{"identifier": "A", "content": "CrO<sub>2</sub>"}, {"identifier": "B", "content": "VO<sub>2</sub>"}, {"identifier": "C", "content": "MnO<sub>2</sub>"}, {"identifier": "D", "content": "TiO<sub>2</sub>"}] | ["A"] | null | Out of all the four given metallic oxides $$Cr{O_2}$$ is attracted by magnetic field very strongly. The effect persists even when the magnetic field is removed. Thus $$Cr{O_2}$$ is metallic and ferromagnetic in nature. | mcq | jee-main-2016-offline | 1,879 |
dcWMvOofLYfatKDV | chemistry | d-and-f-block-elements | properties-of-transition-elements | The reaction of zinc with dilute and concentrated nitric acid, respectively, produces : | [{"identifier": "A", "content": "NO<sub>2</sub> and NO"}, {"identifier": "B", "content": "NO and N<sub>2</sub>O"}, {"identifier": "C", "content": "NO<sub>2</sub> and N<sub>2</sub>O"}, {"identifier": "D", "content": "N<sub>2</sub>O and NO<sub>2</sub>"}] | ["D"] | null | <img class="question-image" src="https://res.cloudinary.com/dckxllbjy/image/upload/v1734265690/exam_images/ftutvkkqco7fgdml85sd.webp" loading="lazy" alt="JEE Main 2016 (Offline) Chemistry - d and f Block Elements Question 200 English Explanation"> | mcq | jee-main-2016-offline | 1,880 |
NkZEuTNQSoNDA0AV85XZv | chemistry | d-and-f-block-elements | properties-of-transition-elements | The pair of compounds having metals in their highest oxidation state is : | [{"identifier": "A", "content": "MnO<sub>2</sub> and CrO<sub>2</sub>Cl<sub>2</sub> "}, {"identifier": "B", "content": "[NiCl<sub>4</sub>]<sup>2$$-$$</sup> and [CoCl<sub>4</sub>]<sup>2$$-$$</sup> "}, {"identifier": "C", "content": "[Fe(CN)<sub>6</sub>]<sup>3$$-$$</sup> and [Cu(CN)<sub>4</sub>]<sup>2$$-$$</sup>"}, {"i... | ["A"] | null | <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;border-width:1px;font-family:Arial,... | mcq | jee-main-2017-online-8th-april-morning-slot | 1,881 |
gaA0LD1rUUEOITt1JGxwE | chemistry | d-and-f-block-elements | properties-of-transition-elements | Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ? | [{"identifier": "A", "content": "Ti<sup>2+</sup> "}, {"identifier": "B", "content": "V<sup>2+</sup> "}, {"identifier": "C", "content": "Cr<sup>2+</sup> "}, {"identifier": "D", "content": "Mn<sup>2+</sup> "}] | ["D"] | null | The third ionisation energy of Mn is too high due to
stable half filled 3d-orbital. Hence, it cannot further get oxidised
to liberate hydrogen. | mcq | jee-main-2017-online-9th-april-morning-slot | 1,882 |
QNm9gElfLK0sQuob | chemistry | d-and-f-block-elements | properties-of-transition-elements | In the following reactions, ZnO is respectively acting as a/an :<br/><br/>
(a) ZnO + Na<sub>2</sub>O $$\to$$ Na<sub>2</sub>ZnO<sub>2</sub><br/><br/>
(b) ZnO + CO<sub>2</sub> $$\to$$ ZnCO<sub>3</sub> | [{"identifier": "A", "content": "base and base "}, {"identifier": "B", "content": "acid and acid "}, {"identifier": "C", "content": "acid and base"}, {"identifier": "D", "content": "base and acid"}] | ["C"] | null | Zinc oxide (ZnO) when react with Na<sub>2</sub>O it act as acid while with CO<sub>2</sub> it act as base. Therefore, it is an amphoteric oxide.
<br><br>(a) ZnO + Na<sub>2</sub>O $$\to$$ Na<sub>2</sub>ZnO<sub>2</sub>
<br> Acid Base &... | mcq | jee-main-2017-offline | 1,883 |
29z4WLBVmkEWrQH1s65uX | chemistry | d-and-f-block-elements | properties-of-transition-elements | The <b>incorrect</b> statement is : | [{"identifier": "A", "content": "Cu<sup>2+</sup> salts give red coloured borax bead test in reducing flame. "}, {"identifier": "B", "content": "Cu2<sup>+</sup> and Ni<sup>2+</sup> ions give black precipitate with H<sub>2</sub>S in presence of HCl solution. "}, {"identifier": "C", "content": "Ferric ion gives blood red ... | ["B"] | null | <p>Cu<sup>2+</sup> and Ni<sup>2+</sup> ions belong to Group II and Group IV respectively.</p>
<img src="https://app-content.cdn.examgoal.net/fly/@width/image/1l3xb1ktk/925df3ad-9a20-40db-aec3-efcc765d6884/51d6e990-e29b-11ec-8ea3-fd6d660fc854/file-1l3xb1ktl.png?format=png" data-orsrc="https://app-content.cdn.examgoal.ne... | mcq | jee-main-2018-online-16th-april-morning-slot | 1,884 |
72wdcRU913iyDz3goz3rsa0w2w9jx84mp1q | chemistry | d-and-f-block-elements | properties-of-transition-elements | The pair that has similar atomic radii is : | [{"identifier": "A", "content": "Mo and W"}, {"identifier": "B", "content": "Mn and Fe"}, {"identifier": "C", "content": "Ti and Hf"}, {"identifier": "D", "content": "Sc and Ni"}] | ["A"] | null | Electron configuration of Mo(Molybdenum) = [Kr] 4d<sup>5</sup> 5s<sup>1</sup>. So it belongs to 4d series.
<br><br/>Electron configuration of W(Tungsten) = [Xe] 4f<sup>14</sup> 5d<sup>4</sup> 6s<sup>2</sup>. So it belongs to 5d series.
<br><br>Size of 3d < 4d = 5d. Due to lanthanoid contraction size of 4d and 5d ser... | mcq | jee-main-2019-online-12th-april-evening-slot | 1,886 |
UnC644xgIaYoAbpIMK3rsa0w2w9jx0wy2s5 | chemistry | d-and-f-block-elements | properties-of-transition-elements | The correct order of the first ionization enthalpies is : | [{"identifier": "A", "content": "Ti < Mn < Zn < Ni"}, {"identifier": "B", "content": "Zn < Ni < Mn < Ti"}, {"identifier": "C", "content": "Mn < Ti < Zn < Ni"}, {"identifier": "D", "content": "Ti < Mn < Ni < Zn"}] | ["D"] | null | In a period, from left to right ionization enthalpy increses.
<br><br>So in period 4, correct order for those 4 elements is
<br><br>Ti < Mn < Ni < Zn
<br><br>Exceptions in period 4 are
<br><br>(1) V(Vanadium) < Ti(Titanium)
<br><br>(2) Ni(Titanium) < Co(Cobalt)
<br><br>(3) Ga(Gallium) < Zn(Zinc)
<br><... | mcq | jee-main-2019-online-10th-april-evening-slot | 1,887 |
jAjxHUi8dGw6c6ergM3rsa0w2w9jx0vnj7e | chemistry | d-and-f-block-elements | properties-of-transition-elements | The INCORRECT statement is : | [{"identifier": "A", "content": "the color of [CoCl(NH<sub>3</sub>)<sub>5</sub>]<sup>2+</sup> is violet as it absorbs the yellow light."}, {"identifier": "B", "content": "the gemstone, ruby, has Cr<sup>3+</sup> ions occupying the octahedral sites of beryl."}, {"identifier": "C", "content": "the spin-only magnetic momen... | ["B"] | null | (A) Complementarty color of yellow is violet. As [CoCl(NH<sub>3</sub>)<sub>5</sub>]<sup>2+</sup> absorbs yellow so it will show complementary color violet.
<br><br>(B)The building block of ruby is aluminium oxide (Al<sub>2</sub>O<sub>3</sub>) containing about 0.5 – 1% Cr<sup>3+</sup> ions which are randomly
distributed... | mcq | jee-main-2019-online-10th-april-evening-slot | 1,888 |
zrVLr8ceUTyQreQyErrNL | chemistry | d-and-f-block-elements | properties-of-transition-elements | The statement that is INCORRECT about the
interstitial compounds is : | [{"identifier": "A", "content": "They are chemically reactive"}, {"identifier": "B", "content": "They have metallic conductivity"}, {"identifier": "C", "content": "They have high melting points"}, {"identifier": "D", "content": "They are very hard"}] | ["A"] | null | Interstitial compound are –
<br><br>(i) very hard
<br><br>(ii) chemically inert
<br><br>(iv) high melting point.
<br><br>As interstitial compounds are chamically inert. | mcq | jee-main-2019-online-8th-april-evening-slot | 1,889 |
46UxNzW3L3kHE8SIbHDFz | chemistry | d-and-f-block-elements | properties-of-transition-elements | The element that usually does NOT show variable oxidation states is : | [{"identifier": "A", "content": "V"}, {"identifier": "B", "content": "Cu"}, {"identifier": "C", "content": "Sc"}, {"identifier": "D", "content": "ti"}] | ["C"] | null | Sc<sup>3+</sup> has noble gas configuration hence only +3 exists.
<br><br>Most common oxidation states of :
<br><br/>(i) Sc : +3
<br><br/>(ii) V : +2, +3, +4, +5
<br><br/>(iii) Ti : +2, +3, +4
<br><br/>(iv) Cu : +1, +2 | mcq | jee-main-2019-online-11th-january-morning-slot | 1,890 |
qQs8g3YGZrpLu4Wo2eSO2 | chemistry | d-and-f-block-elements | properties-of-transition-elements | The transition element that has lowest enthalpy of atomisation, is : | [{"identifier": "A", "content": "Fe"}, {"identifier": "B", "content": "Cu"}, {"identifier": "C", "content": "V"}, {"identifier": "D", "content": "Zn"}] | ["B"] | null | Since Zn is not a transition element so transition element having lowest atomisation energy out of Cu, V, Fe is Cu. | mcq | jee-main-2019-online-9th-january-evening-slot | 1,891 |
cLlbls1u2VuJCmxa8J3rsa0w2w9jwv595b6 | chemistry | d-and-f-block-elements | properties-of-transition-elements | Consider the hydrated ions of Ti<sup>2+</sup>, V<sup>2+</sup>, Ti<sup>3+</sup>, and Sc<sup>3+</sup>. The correct order of their spin-only magnetic
moments is : | [{"identifier": "A", "content": "Sc<sup>3+</sup> < Ti<sup>3+</sup> < V<sup>2+</sup> < Ti<sup>2+</sup>"}, {"identifier": "B", "content": "Sc<sup>3+</sup> < Ti<sup>3+</sup> < Ti<sup>2+</sup> < V<sup>2+</sup> "}, {"identifier": "C", "content": "Ti<sup>3+</sup> < Ti<sup>2+</sup> < Sc<sup>3+</sup> &... | ["B"] | null | As we know that
<br><br>$$\mu = \sqrt {n\left( {n + 2} \right)} $$
where n = no. of unpaired electrons i.e. greater the no. of unpaired electron more will be the spin-only magnetic moments.
<br><br>. Electronic configuration of the given transition
metal ions are
<br><br>Sc<sup>3+</sup> (Z = 21) = 1s<sup>2</sup>2s<sup... | mcq | jee-main-2019-online-10th-april-morning-slot | 1,892 |
IGNpQdkaQP2HUPSpUMjgy2xukfc7rdzf | chemistry | d-and-f-block-elements | properties-of-transition-elements | The incorrect statement(s) among (a) - (c) is
(are)
<br/><br/>(a) W(VI) is more stable than Cr(VI).
<br/><br>(b) In the presence of HCl, permanganate
titrations provide satisfactory results.
<br/><br>(c) Some lanthanoid oxides can be used as
phosphors.</br></br> | [{"identifier": "A", "content": "(a) and (b) only"}, {"identifier": "B", "content": "(a) only"}, {"identifier": "C", "content": "(b) only"}, {"identifier": "D", "content": "(b) and (c) only"}] | ["C"] | null | W(VI) is more stable than Cr(VI)
<br><br>Permanganate titrations in presence of HCl
are unsatisfactory as HCl is oxidised to Cl<sub>2</sub>
<br><br>Lanthanoid oxides are used as phosphors. | mcq | jee-main-2020-online-4th-september-evening-slot | 1,893 |
rf72m9NwGZF3e0at8kjgy2xukfupzwsz | chemistry | d-and-f-block-elements | properties-of-transition-elements | The set that contains atomic numbers of only
transition elements, is : | [{"identifier": "A", "content": "21, 32, 53, 64"}, {"identifier": "B", "content": "9, 17, 34, 38"}, {"identifier": "C", "content": "37, 42, 50, 64"}, {"identifier": "D", "content": "21, 25, 42, 72"}] | ["D"] | null | Elements with atomic number 21, 25, 42 and 72
belongs to transition metals.
<br><br>Tranition elements
<br>= 21 to 30
<br>37 to 48
<br>57 & 72 to 80 | mcq | jee-main-2020-online-6th-september-morning-slot | 1,894 |
XGDo6LHy3Q7xpRmLOR1klrf0f1y | chemistry | d-and-f-block-elements | properties-of-transition-elements | Given below are two statements :<br/><br/>
<b>Statement I :</b> Colourless cupric metaborate is reduced to cuprous metaborate in a luminous
flame.<br/><br/>
<b>Statement II :</b> Cuprous metaborate is obtained by heating boric anhydride and copper
sulphate in a non-luminous flame.<br/><br/>
In the light of the above st... | [{"identifier": "A", "content": "Statement I is true but Statement II is false"}, {"identifier": "B", "content": "Statement I is false but Statement II is true"}, {"identifier": "C", "content": "Both Statement I and Statement II are false"}, {"identifier": "D", "content": "Both Statement I and Statement II are true"}] | ["C"] | null | In presence of luminous flame, blue cupric metaborate is
reduced to colourless cuprous metaborate.
<br><br><img src="https://app-content.cdn.examgoal.net/fly/@width/image/1kxhdohre/9ca5b63b-06ff-46d8-88a6-1804b0258ce3/caadf4a0-630f-11ec-b36d-0fa4fbfb1e31/file-1kxhdohrf.png?format=png" data-orsrc="https://app-content.cd... | mcq | jee-main-2021-online-24th-february-morning-slot | 1,895 |
X2VwEKJZGNlP1mQDw51klruko33 | chemistry | d-and-f-block-elements | properties-of-transition-elements | What is the correct order of the following elements with respect to their density? | [{"identifier": "A", "content": "Cr < Zn < Co < Cu < Fe"}, {"identifier": "B", "content": "Cr < Fe < Co < Cu < Zn"}, {"identifier": "C", "content": "Zn < Cr < Fe < Co < Cu"}, {"identifier": "D", "content": "Zn < Cu < Co < Fe < Cr"}] | ["C"] | null | <p>Generally, due to decrease in metallic radius and increase in atomic mass density increase across the period from left to right.</p>
<p><table style="undefined;table-layout: fixed; width: 308px">
<colgroup>
<col style="width: 152px">
<col style="width: 156px">
</colgroup>
<thead>
<tr>
<th>Metal</th>
<th>De... | mcq | jee-main-2021-online-24th-february-evening-slot | 1,896 |
7P1TduXRH2wlYGxgqA1klsbh33h | chemistry | d-and-f-block-elements | properties-of-transition-elements | In which of the following pairs, the outer most electronic configuration will be the same? | [{"identifier": "A", "content": "Cr<sup>+</sup> and Mn<sup>2+</sup>"}, {"identifier": "B", "content": "Ni<sup>2+</sup> and Cu<sup>+</sup>"}, {"identifier": "C", "content": "V<sup>2+</sup> and Cr<sup>+</sup>"}, {"identifier": "D", "content": "Fe<sup>2+</sup> and Co<sup>+</sup>"}] | ["A"] | null | Cr<sup>+</sup> $$ \to $$ [Ar]3d<sup>5</sup>
<br><br>Mn<sup>2+</sup> $$ \to $$ [Ar]3d<sup>5</sup> | mcq | jee-main-2021-online-25th-february-morning-slot | 1,897 |
r60mcpRedI2Jzl2mAq1kmkjnxs8 | chemistry | d-and-f-block-elements | properties-of-transition-elements | In the ground state of atomic Fe(Z = 26), the spin-only magnetic moment is ____________ $$\times$$ 10<sup>$$-$$1</sup> BM. (Round off to the Nearest Integer). [Given : $$\sqrt 3 $$ = 1.73, $$\sqrt 2 $$ = 1.41 ] | [] | null | 49 | $${}_{26}Fe = [Ar]3{d^6}4{s^2}$$<br><br>No. of unpaired electrons = 4<br><br>$$\mu = \sqrt {n(n + 2)} BM$$<br><br>$$ = \sqrt {4(4 + 2)} = \sqrt {24} $$<br><br>$$ = 2\sqrt {3 \times 2} = 2[1.73 \times 1.41]$$<br><br>= 4.8786 BM<br><br>= $$48.78 \times {10^{ - 1}}$$ BM | integer | jee-main-2021-online-17th-march-evening-shift | 1,900 |
1krt55gkz | chemistry | d-and-f-block-elements | properties-of-transition-elements | The set having ions which are coloured and paramagnetic both is : | [{"identifier": "A", "content": "Cu<sup>2+</sup>, Cr<sup>3+</sup>, Sc<sup>+</sup>"}, {"identifier": "B", "content": "Cu<sup>2+</sup>, Zn<sup>2+</sup>, Mn<sup>4+</sup>"}, {"identifier": "C", "content": "Sc<sup>3+</sup>, V<sup>5+</sup>, Ti<sup>4+</sup>"}, {"identifier": "D", "content": "Ni<sup>2+</sup>, Mn<sup>7+</sup>, ... | ["A"] | null | $$\left. \matrix{
C{u^{2 + }}:[Ar]3{d^9}4{s^0} \hfill \cr
C{r^{3 + }}:[Ar]3{d^3}4{s^0} \hfill \cr
S{c^ + }:[Ar]3{d^1}4{s^1} \hfill \cr} \right]$$All are coloured and paramagnetic due to presence of unpaired electrons | mcq | jee-main-2021-online-22th-july-evening-shift | 1,901 |
1krt738zg | chemistry | d-and-f-block-elements | properties-of-transition-elements | Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to _____________ | [] | null | 12 | $${}_{23}V:1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}3{d^3}4{s^2}$$<br><br>Number of electrons in p-orbitals is equal to 12.00. | integer | jee-main-2021-online-22th-july-evening-shift | 1,902 |
1krx64sfv | chemistry | d-and-f-block-elements | properties-of-transition-elements | The spin only magnetic moments (in BM) for free Ti<sup>3+</sup>, V<sup>2+</sup> and Sc<sup>3+</sup> ions respectively are :<br/><br/>(At.No. Sc : 21, Ti : 22, V : 23) | [{"identifier": "A", "content": "3.87, 1.73, 0"}, {"identifier": "B", "content": "1.73, 3.87, 0"}, {"identifier": "C", "content": "1.73, 0, 3.87"}, {"identifier": "D", "content": "0, 3.87, 1.73"}] | ["B"] | null | $$\mu = \sqrt {n(n + 2)} BM$$<br><br>$$\matrix{
{T{i^{ + 3}} = [Ar]3{d^1}} & {n = 1} & {\mu = 1.73\,BM} \cr
{{V^{ + 2}} = [Ar]3{d^3}} & {n = 3} & {\mu = 3.87\,BM} \cr
{S{c^{ + 3}} = [Ar]3{d^0}4{s^0}} & {n = 0} & {\mu = 0} \cr
} $$ | mcq | jee-main-2021-online-25th-july-evening-shift | 1,903 |
1ktb3tx4q | chemistry | d-and-f-block-elements | properties-of-transition-elements | Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere? | [{"identifier": "A", "content": "CuCl<sub>2</sub>"}, {"identifier": "B", "content": "AgCl"}, {"identifier": "C", "content": "ZnCl<sub>2</sub>"}, {"identifier": "D", "content": "Cu<sub>2</sub>Cl<sub>2</sub>"}] | ["A"] | null | (a) CuCl<sub>2</sub> + nH<sub>2</sub>O $$\to$$ Cu$$_{(aq.)}^{ + 2}$$ (blue colour)<br><br>(b) AgCl + nH<sub>2</sub>O $$\to$$ Insoluble<br><br>(c) ZnCl<sub>2</sub> + nH<sub>2</sub>O $$\to$$ Zn$$_{(aq.)}^{ + 2}$$ Colourless<br><br>(d) Cu<sub>2</sub>Cl<sub>2</sub> + nH<sub>2</sub>O $$\to$$ Insoluble | mcq | jee-main-2021-online-26th-august-morning-shift | 1,904 |
1ktecd6r2 | chemistry | d-and-f-block-elements | properties-of-transition-elements | The nature of oxides V<sub>2</sub>O<sub>3</sub> and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is : | [{"identifier": "A", "content": "<table>\n<thead>\n <tr>\n <td>X = basic</td>\n <td></td>\n <td>Y = amphoteric</td>\n </tr>\n</thead>\n</table>"}, {"identifier": "B", "content": "<table>\n<thead>\n <tr>\n <td>X = amphoteric</td>\n <td></td>\n <td>Y = basic</td>\n </tr>\n</thead>\n</table>"}, {"ide... | ["D"] | null | V<sub>2</sub>O<sub>3</sub> basic<br><br>CrO basic | mcq | jee-main-2021-online-27th-august-morning-shift | 1,905 |
1ktjyhq0v | chemistry | d-and-f-block-elements | properties-of-transition-elements | The value of magnetic quantum number of the outermost electron of Zn<sup>+</sup> ion is ______________. | [] | null | 0 | Zn<sup>+</sup> $$\to$$ 1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>3d<sup>10</sup>4s<sup>1</sup><br><br>Outermost electron is in 4s subshell<br><br>m = 0 | integer | jee-main-2021-online-31st-august-evening-shift | 1,906 |
1ktn1sujz | chemistry | d-and-f-block-elements | properties-of-transition-elements | Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d<sup>5</sup> : | [{"identifier": "A", "content": "Ru"}, {"identifier": "B", "content": "Mn"}, {"identifier": "C", "content": "Co"}, {"identifier": "D", "content": "Fe"}] | ["D"] | null | Mn(25) = [Ar]3d<sup>5</sup>4s<sup>2</sup>
<br><br>Mn<sup>+3</sup> = [Ar]3d<sup>4</sup>4s<sup>0</sup>
<br><br>Ru-belongs to 4d transition series
<br><br>Co (27) = [Ar]3d<sup>7</sup>4s<sup>2</sup>
<br><br>Co<sup>+3</sup> = [Ar]3d<sup>6</sup>4s<sup>0</sup>
<br><br>Fe(26) = [Ar]3d<sup>6</sup>4s<sup>2</sup>
<br><br>Fe<sup>+... | mcq | jee-main-2021-online-1st-september-evening-shift | 1,907 |
1l548o996 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>The electronic configuration of Pt (atomic number 78) is :</p> | [{"identifier": "A", "content": "[Xe] 4f<sup>14</sup> 5d<sup>9</sup> 6s<sup>1</sup>"}, {"identifier": "B", "content": "[Kr] 4f<sup>14</sup> 5d<sup>10</sup>"}, {"identifier": "C", "content": "[Xe] 4f<sup>14</sup> 5d<sup>10</sup>"}, {"identifier": "D", "content": "[Xe] 4f<sup>14</sup> 5d<sup>8</sup> 6s<sup>2</sup>"}] | ["A"] | null | Atomic number of Pt is 78<br/><br/>
Electronic configuration is – <sub>78</sub>Pt $$ \to $$ [Xe] 4 f<sup>14</sup> 5d<sup>9</sup> 6s<sup>1</sup> (Exceptional electronic
configuration) | mcq | jee-main-2022-online-29th-june-morning-shift | 1,908 |
1l54zcda8 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Spin only magnetic moment of [MnBr<sub>6</sub>]<sup>4$$-$$</sup> is _________ B.M. (round off to the closest integer)</p> | [] | null | 6 | $\begin{aligned} & {\left[\mathrm{MnBr}_6\right]^{4-}} \\\\ & x-6=-4\end{aligned}$
<br><br>$$
\begin{aligned}
x & =+2 \\\\
\mathrm{Mn} & =[\mathrm{Ar}] 3 d^5 4 s^2 \\\\
\mathrm{Mn}^{2+} & =[\mathrm{Ar}] 3 d^5 4 s^0
\end{aligned}
$$
<br><br><img src="https://app-content.cdn.examgoal.net/fly/@width/im... | integer | jee-main-2022-online-29th-june-evening-shift | 1,909 |
1l54zdjf5 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>For the reaction given below :</p>
<p>CoCl<sub>3</sub> . xNH<sub>3</sub> + AgNO<sub>3</sub> (aq) $$\to$$</p>
<p>If two equivalents of AgCl precipitate out, then the value of x will be _____________.</p> | [] | null | 5 | $$
\begin{aligned}
&\mathrm{CoCl}_3 \cdot \mathrm{xNH}_3+\mathrm{AgNO}_3 \rightarrow \underset{\text{2 mol}}{\mathrm{AgCl} \downarrow}\\\\
&\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2+\mathrm{AgNO}_3 \rightarrow \underset{\text{2 mol}}{\mathrm{AgCl}} \downarrow\\\\
&x=5
\end{aligned}
... | integer | jee-main-2022-online-29th-june-evening-shift | 1,910 |
1l59qzy9a | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>The metal ion (in gaseous state) with lowest spin-only magnetic moment value is :</p> | [{"identifier": "A", "content": "V<sup>2+</sup>"}, {"identifier": "B", "content": "Ni<sup>2+</sup>"}, {"identifier": "C", "content": "Cr<sup>2+</sup>"}, {"identifier": "D", "content": "Fe<sup>2+</sup>"}] | ["B"] | null | <table style="width:100%;text-align:left;min-width:460px">
<thead>
<tr>
<th></th>
<th>Valence shell configuration</th>
<th>Unpaired electrons</th>
</tr>
</thead>
<tbody>
<tr>
<td>V<sup>2+</sup></td>
<td>3d<sup>3</sup>4s<sup>0</sup></td>
<td>n = 3</td>
</tr>
<tr>
<td>Ni<sup>2+</sup>... | mcq | jee-main-2022-online-25th-june-evening-shift | 1,911 |
1l5bd4516 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be :</p> | [{"identifier": "A", "content": "Hg"}, {"identifier": "B", "content": "Ag"}, {"identifier": "C", "content": "Ga"}, {"identifier": "D", "content": "Cs"}] | ["B"] | null | Melting points of the given metals<br/><br/>
Hg : –38.83° C<br/><br/>
Ag : 961.8° C<br/><br/>
Ga : 29.76° C<br/><br/>
Cs : 28.44° C<br/><br/>
$$ \therefore $$ Metal having highest melting point is Ag. | mcq | jee-main-2022-online-24th-june-evening-shift | 1,913 |
1l6i6jv62 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>The spin-only magnetic moment value of the compound with strongest oxidizing ability among $$\mathrm{MnF}_{4}, \mathrm{MnF}_{3}$$ and $$\mathrm{MnF}_{2}$$ is ____________ B.M. [nearest integer]</p> | [] | null | 5 | $\mathrm{MnF}_{3}$ has the strongest oxidizing ability
<br/><br/>
$$
\left[\begin{array}{l}
\mathrm{E}_{\mathrm{Mn}^{+3} / \mathrm{Mn}^{+2}}^{\circ} \simeq 1.57 \mathrm{~V} \\
\& \,\,\mathrm{E}_{\mathrm{Mn}^{+4} / \mathrm{Mn}^{+2}}^{\circ} \simeq 1.2 \mathrm{~V}
\end{array}\right]
$$
<br/><br/>
So, spin only magnetic m... | integer | jee-main-2022-online-26th-july-evening-shift | 1,915 |
1l6mcxhni | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Which of the following has least tendency to liberate $$\mathrm{H}_{2}$$ from mineral acids?</p> | [{"identifier": "A", "content": "Cu"}, {"identifier": "B", "content": "Mn"}, {"identifier": "C", "content": "Ni"}, {"identifier": "D", "content": "Zn"}] | ["A"] | null | The metal atom whose oxidation potential is less than that of hydrogen can release $\mathrm{H}_{2}$ from mineral acids.<br/><br/>
$\mathrm{E}_{\mathrm{Zn} / \mathrm{Zn}^{+2}}=0.76$<br/><br/>
$\mathrm{E}_{\mathrm{Ni/Ni}^{+ 2}}=0.25$<br/><br/>
$E_{M n / M n^{+2}}=1.18$<br/><br/>
$\mathrm{E}_{\mathrm{Cu}^{\circ} / \mathrm... | mcq | jee-main-2022-online-28th-july-morning-shift | 1,916 |
1l6p73eob | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :</p> | [{"identifier": "A", "content": "$$\\mathrm{Zn}(\\mathrm{OH})_{2}$$"}, {"identifier": "B", "content": "$$\\mathrm{ZnO}$$"}, {"identifier": "C", "content": "$$\\left[\\mathrm{Zn}(\\mathrm{OH})_{4}\\right]^{2-}$$"}, {"identifier": "D", "content": "$$\\left[\\mathrm{ZnO}_{2}\\right]^{2-}$$"}] | ["C"] | null | Zinc dissolves in excess of aqueous alkali.
<br/><br/>
$$\mathrm{Zn}+2 \mathrm{OH}^{-}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]^{2-}+\mathrm{H}_{2} \uparrow$$ (Tetrahydroxozincate(II) ion)
<br/><br/>
However, this reaction in NCERT is given as
<br/><br/>
$$\mathrm{Zn}+2 \math... | mcq | jee-main-2022-online-29th-july-morning-shift | 1,917 |
1l6rju2l8 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Which of the following $$3\mathrm{d}$$-metal ion will give the lowest enthalpy of hydration $$\left(\Delta_{\text {hyd }} \mathrm{H}\right)$$ when dissolved in water ?</p> | [{"identifier": "A", "content": "$$\\mathrm{Cr}^{2+}$$"}, {"identifier": "B", "content": "$$\\operatorname{Mn}^{2+}$$"}, {"identifier": "C", "content": "$$\\mathrm{Fe}^{2+}$$"}, {"identifier": "D", "content": "$$\\mathrm{Co}^{2+}$$"}] | ["B"] | null | <img src="https://app-content.cdn.examgoal.net/fly/@width/image/1l7nqenb4/4f3d4ac9-5962-42fb-8440-0a07e7a5ae6e/6d3cf800-2c88-11ed-a521-1f85f535c206/file-1l7nqenb5.png?format=png" data-orsrc="https://app-content.cdn.examgoal.net/image/1l7nqenb4/4f3d4ac9-5962-42fb-8440-0a07e7a5ae6e/6d3cf800-2c88-11ed-a521-1f85f535c206/fi... | mcq | jee-main-2022-online-29th-july-evening-shift | 1,919 |
1ldo2crr0 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).</p>
<p>Assertion (A) : $$\mathrm{Cu^{2+}}$$ in water is more stable than $$\mathrm{Cu^{+}}$$.</p>
<p>Reason (R) : Enthalpy of hydration for $$\mathrm{Cu^{2+}}$$ is much less than that of $$\mathrm{Cu^{+}}$$.</p... | [{"identifier": "A", "content": "(A) is correct but (R) is not correct"}, {"identifier": "B", "content": "Both (A) and (R) are correct but (R) is not the correct explanation of (A)"}, {"identifier": "C", "content": "(A) is not correct but (R) is correct"}, {"identifier": "D", "content": "Both (A) and (R) are correct an... | ["A"] | null | Cu<sup>2+</sup> ion is more stable than Cu<sup>+</sup> ion due to high charge density on Cu<sup>2+</sup> ion, it has higher hydration energy when it bonds to water molecules thus it forms stronger bonds.
<br/><br/>$$ \therefore $$ (A) is correct but (R) is not correct. | mcq | jee-main-2023-online-1st-february-evening-shift | 1,920 |
1ldoiic07 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Highest oxidation state of Mn is exhibited in $$\mathrm{Mn_2O_7}$$. The correct statements about $$\mathrm{Mn_2O_7}$$ are</p>
<p>(A) Mn is tetrahedrally surrounded by oxygen atoms.</p>
<p>(B) Mn is octahedrally surrounded by oxygen atoms.</p>
<p>(C) Contains Mn-O-Mn bridge.</p>
<p>(D) Contains Mn-Mn bond.</p>
<p>Cho... | [{"identifier": "A", "content": "A and C only"}, {"identifier": "B", "content": "A and D only"}, {"identifier": "C", "content": "B and C only"}, {"identifier": "D", "content": "B and D only"}] | ["A"] | null | <p>The correct statements about $$\mathrm{Mn_2O_7}$$ are:</p>
<p>(A) Mn is tetrahedrally surrounded by oxygen atoms.</p>
<p>(C) Contains Mn-O-Mn bridge.</p>
<p><img src="https://app-content.cdn.examgoal.net/fly/@width/image/1ldplhphd/0cf09014-aa6f-445a-921f-fba14d6e12ff/12456b10-a458-11ed-aba0-c590fd487309/file-1ldpl... | mcq | jee-main-2023-online-1st-february-morning-shift | 1,921 |
1ldpo9hzf | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>$$\mathrm{Nd^{2+}}$$ = __________</p> | [{"identifier": "A", "content": "$$\\mathrm{4f^4 6s^2}$$"}, {"identifier": "B", "content": "$$\\mathrm{4f^3}$$"}, {"identifier": "C", "content": "$$\\mathrm{4f^4}$$"}, {"identifier": "D", "content": "$$\\mathrm{4f^2 6s^2}$$"}] | ["C"] | null | Nd(60) = [Xe] 4f<sup>4</sup> 5d<sup>0</sup> 6s<sup>2</sup>
<br/><br/>Nd<sup>2+</sup>
= [Xe] 4f<sup>4</sup> 5d<sup>0</sup> 5s<sup>0</sup> | mcq | jee-main-2023-online-31st-january-morning-shift | 1,922 |
1ldsc4z1h | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Given below are two statements :</p>
<p>Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats.</p>
<p>Statement II : Silicon forms both electron rich and electron deficient hydrides.</p>
<p>In the light of the above statements, choose the most appropriate answer from the options gi... | [{"identifier": "A", "content": "Statement I is correct but statement II is incorrect"}, {"identifier": "B", "content": "Both the statements I and II are correct"}, {"identifier": "C", "content": "Both the statements I and II are incorrect"}, {"identifier": "D", "content": "Statement I is incorrect but statement II is ... | ["A"] | null | <p>Statement I is correct, Statement II is incorrect as Si forms electron precise hydride.</p> | mcq | jee-main-2023-online-29th-january-evening-shift | 1,924 |
1ldsckotv | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>The set of correct statements is :</p>
<p>(i) Manganese exhibits +7 oxidation state in its oxide.</p>
<p>(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.</p>
<p>(iii) Sc shows +4 oxidation state which is oxidizing in nature.</p>
<p>(iv) Cr shows oxidising nature in +6 oxidation state.</p> | [{"identifier": "A", "content": "(ii), (iii) and (iv)"}, {"identifier": "B", "content": "(ii) and (iii)"}, {"identifier": "C", "content": "(i) and (iii)"}, {"identifier": "D", "content": "(i), (ii) and (iv)"}] | ["D"] | null | <p>(i) $$\mathrm{Mn_2O_7\to Mn}$$ in (+7) oxidation state</p>
<p>(ii) It is also correct</p>
<p>(iii) Sc only shows +3 oxidation state</p>
<p>(iv) $$\mathrm{Cr^{+6}}$$ is oxidising in nature</p> | mcq | jee-main-2023-online-29th-january-evening-shift | 1,925 |
1ldv0ui0t | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? ______________</p>
<p>(Given : Atomic number V, 23; Cr, 24; Fe, 26; Ni, 28)</p>
<p>V$$^{3+}$$, Cr$$^{3+}$$, Fe$$^{2+}$$, Ni$$^{3+}$$</p> | [] | null | 2 | $\mu_{\mathrm{s}}=\sqrt{\mathrm{n}(\mathrm{n}+2)} \mathrm{BM} \quad(\mathrm{n}=\mathrm{no}$ of unpaired electrons)<br/><br/>
$$
\begin{array}{ll}
& n \\
\mathrm{V}^{3+}:[\mathrm{Ar}] 3 \mathrm{~d}^2 4 \mathrm{~s}^0 & 2 \\\\
\mathrm{Cr}^{3+}:[\mathrm{Ar}] 3 \mathrm{~d}^3 4 \mathrm{~s}^0 & 3 \\\\
\mathrm{Fe}^{2+}:[\math... | integer | jee-main-2023-online-25th-january-morning-shift | 1,926 |
lgo0cpse | chemistry | d-and-f-block-elements | properties-of-transition-elements | In Chromyl chloride, the oxidation state of chromium is $(+)$ _______________. | [] | null | 6 | In chromyl chloride, $\mathrm{CrO}_2\mathrm{Cl}_2$, the oxidation state of chromium can be calculated by assigning oxidation states to the other atoms in the molecule and then using the fact that the sum of the oxidation states in a molecule must be equal to zero.
<br/><br/>
The oxidation state of oxygen is usually -2 ... | integer | jee-main-2023-online-15th-april-morning-shift | 1,927 |
1lgygcvay | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Which of the following statements are correct?</p>
<p>(A) The M$$^{3+}$$/M$$^{2+}$$ reduction potential for iron is greater than manganese.</p>
<p>(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion.</p>
<p>(C) Aqueous solution of Cr$$^{2+}$$ can liberate hydrogen from dilute ac... | [{"identifier": "A", "content": "(B), (C) only"}, {"identifier": "B", "content": "(A), (B) only"}, {"identifier": "C", "content": "(A), (B), (D) only"}, {"identifier": "D", "content": "(C), (D) only"}] | ["A"] | null | The reduction electrode potential of $\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}$ is $+1.57 \mathrm{~V}$ while that of $\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}$ is $+0.77 \mathrm{~V}$, hence $\mathrm{A}$ is wrong. Higher oxidation state of smaller $d$-block elements is stabilized (or say form compounds) with smaller anion oxide t... | mcq | jee-main-2023-online-10th-april-morning-shift | 1,929 |
1lh039s6e | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>In chromyl chloride, the number of d-electrons present on chromium is same as in<br/><br/> (Given at no. of $$\mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}: 24, \mathrm{Mn}: 25, \mathrm{Fe}: 26$$ )</p> | [{"identifier": "A", "content": "Mn (VII)"}, {"identifier": "B", "content": "Ti (III)"}, {"identifier": "C", "content": "Fe (III)"}, {"identifier": "D", "content": "V (IV)"}] | ["A"] | null | When a mixture containing chloride ion is heated with $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and concentrated $\mathrm{H}_2 \mathrm{SO}_{4^{\prime}}$ deep orange-red fumes of chromyl chloride $\left(\mathrm{CrO}_2 \mathrm{Cl}_2\right)$ are formed<br><br>
$$
\begin{aligned}
& \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}... | mcq | jee-main-2023-online-8th-april-morning-shift | 1,930 |
1lh324jwf | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p> Given below are two statements: one is labelled as "Assertion A" and the other is labelled as "Reason R"</p>
<p>Assertion A : In the complex $$\mathrm{Ni}(\mathrm{CO})_{4}$$ and $$\mathrm{Fe}(\mathrm{CO})_{5}$$, the metals have zero oxidation state.</p>
<p>Reason R : Low oxidation states are found when a complex ha... | [{"identifier": "A", "content": "A is not correct but R is correct"}, {"identifier": "B", "content": "A is correct but R is not correct"}, {"identifier": "C", "content": "Both A and R are correct but R is NOT the correct explanation of A"}, {"identifier": "D", "content": "Both A and R are correct and R is the correct e... | ["B"] | null |
<li><strong>Option B: "A is correct but R is incorrect"</strong> is the right answer. Here is the reasoning:</li>
</ol>
<p><strong>Assertion A</strong> is correct. In the complex $$\mathrm{Ni(CO)_4}$$, if we assume the oxidation state of Ni to be x, we can set up the equation:</p>
<p>$
x + (0 \times 4) = 0
$... | mcq | jee-main-2023-online-6th-april-evening-shift | 1,931 |
1lh327e1j | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.</p> | [{"identifier": "A", "content": "aqueous neutral"}, {"identifier": "B", "content": "both aqueous acidic and faintly alkaline"}, {"identifier": "C", "content": "both aqueous acidic and neutral"}, {"identifier": "D", "content": "aqueous acidic"}] | ["A"] | null | <p>In a neutral or weakly alkaline solution, permanganate ions are reduced to MnO₂, with a change in oxidation state from +7 to +4, which is a change of 3 units. </p>
<p>The balanced redox reaction is :</p>
<p>3MnO₄⁻ + 5S₂O₃²⁻ + 2H₂O → 3MnO₂ + 5SO₄²⁻ + 10OH⁻</p> | mcq | jee-main-2023-online-6th-april-evening-shift | 1,932 |
jaoe38c1lsc514nf | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Which of the following electronic configuration would be associated with the highest magnetic moment?</p> | [{"identifier": "A", "content": "$$[\\mathrm{Ar}] 3 \\mathrm{~d}^7$$\n"}, {"identifier": "B", "content": "$$[\\mathrm{Ar}] 3 \\mathrm{~d}^8$$\n"}, {"identifier": "C", "content": "$$[\\mathrm{Ar}] 3 \\mathrm{~d}^3$$\n"}, {"identifier": "D", "content": "$$[\\mathrm{Ar}] 3 \\mathrm{~d}^6$$"}] | ["D"] | null | <p>The magnetic moment of an atom or ion with unpaired electrons is given by the formula $$\mu = \sqrt{n(n+2)}$$ Bohr magnetons (BM), where $$n$$ is the number of unpaired electrons. The magnetic moment depends on the number of unpaired electrons: more unpaired electrons lead to a higher magnetic moment.</p> <p>Looking... | mcq | jee-main-2024-online-27th-january-morning-shift | 1,934 |
jaoe38c1lscruebh | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Choose the correct option having all the elements with $$\mathrm{d}^{10}$$ electronic configuration from the following :</p> | [{"identifier": "A", "content": "$${ }^{46} \\mathrm{Pd},{ }^{28} \\mathrm{Ni},{ }^{26} \\mathrm{Fe},{ }^{24} \\mathrm{Cr}$$\n"}, {"identifier": "B", "content": "$${ }^{29} \\mathrm{Cu},{ }^{30} \\mathrm{Zn},{ }^{48} \\mathrm{Cd},{ }^{47} \\mathrm{Ag}$$\n"}, {"identifier": "C", "content": "$${ }^{27} \\mathrm{Co},{ }^{... | ["B"] | null | <p>$$\begin{aligned}
& {[\mathrm{Cr}]=[\mathrm{Ar}] 4 \mathrm{~s}^1 3 \mathrm{~d}^5} \\
& {[\mathrm{Cd}]=[\mathrm{Kr}] 5 \mathrm{~s}^2 4 \mathrm{~d}^{10}} \\
& {[\mathrm{Cu}]=[\mathrm{Ar}] 4 \mathrm{~s}^1 3 \mathrm{~d}^{10}} \\
& {[\mathrm{Ag}]=[\mathrm{Kr}] 5 \mathrm{~s}^1 4 \mathrm{~d}^{10}} \\
& {[\mathrm{Zn}]=[\mat... | mcq | jee-main-2024-online-27th-january-evening-shift | 1,935 |
jaoe38c1lsfmqt69 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Which of the following statements are correct about $$\mathrm{Zn}, \mathrm{Cd}$$ and $$\mathrm{Hg}$$ ?</p>
<p>A. They exhibit high enthalpy of atomization as the d-subshell is full.</p>
<p>B. $$\mathrm{Zn}$$ and $$\mathrm{Cd}$$ do not show variable oxidation state while $$\mathrm{Hg}$$ shows $$+\mathrm{I}$$ and $$+\... | [{"identifier": "A", "content": "C, D only"}, {"identifier": "B", "content": "B, C only"}, {"identifier": "C", "content": "A, D only"}, {"identifier": "D", "content": "B, D only"}] | ["D"] | null | <p>(A) $$\mathrm{Zn}, \mathrm{Cd}, \mathrm{Hg}$$ exhibit lowest enthalpy of atomization in respective transition series.</p>
<p>(C) Compounds of $$\mathrm{Zn}, \mathrm{Cd}$$ and $$\mathrm{Hg}$$ are diamagnetic in nature.</p> | mcq | jee-main-2024-online-29th-january-evening-shift | 1,936 |
1lsg84uzy | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Number of metal ions characterized by flame test among the following is ________.</p>
<p>$$\mathrm{Sr}^{2+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Co}^{2+}, \mathrm{Fe}^{2+}$$</p> | [] | null | 4 | <p>All the following metal ions will respond to flame test.</p>
<p>$$\mathrm{Sr}^{2+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Cu}^{2+}$$</p> | integer | jee-main-2024-online-30th-january-evening-shift | 1,937 |
luy1mwqj | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>A transition metal '$$\mathrm{M}$$' among $$\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}$$ and $$\mathrm{Fe}$$ has the highest second ionisation enthalpy. The spin-only magnetic moment value of $$\mathrm{M}^{+}$$ ion is _______ BM (Near integer)</p>
<p>(Given atomic number $$\mathrm{Sc}: 21, \mathr... | [] | null | 6 | <p>To solve this problem, we need to understand what factors influence the second ionisation enthalpy of transition metals and how to calculate the spin-only magnetic moment of their ions. The second ionization enthalpy refers to the energy required to remove an electron from the singly charged cation of an element.</p... | integer | jee-main-2024-online-9th-april-evening-shift | 1,939 |
luz2v3a2 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>The electronic configuration of $$\mathrm{Cu}(\mathrm{II})$$ is $$3 \mathrm{~d}^9$$ whereas that of $$\mathrm{Cu}(\mathrm{I})$$ is $$3 \mathrm{~d}^{10}$$. Which of the following is correct?</p> | [{"identifier": "A", "content": "$$\\mathrm{Cu}(\\mathrm{II})$$ is more stable\n"}, {"identifier": "B", "content": "$$\\mathrm{Cu}$$ (II) is less stable\n"}, {"identifier": "C", "content": "$$\\mathrm{Cu}(\\mathrm{I})$$ and $$\\mathrm{Cu}(\\mathrm{II})$$ are equally stable\n"}, {"identifier": "D", "content": "Stability... | ["A"] | null | <p>$$\mathrm{Cu}^{2+}$$ is more stable.</p>
<p>$$\mathrm{Cu}^{+} \longrightarrow \mathrm{Cu}^{2+}+\mathrm{Cu}$$ disproportionation reaction</p> | mcq | jee-main-2024-online-9th-april-morning-shift | 1,940 |
lv5gsk5f | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Iron (III) catalyses the reaction between iodide and persulphate ions, in which</p>
<p>A. $$\mathrm{Fe}^{3+}$$ oxidises the iodide ion</p>
<p>B. $$\mathrm{Fe}^{3+}$$ oxidises the persulphate ion</p>
<p>C. $$\mathrm{Fe}^{2+}$$ reduces the iodide ion</p>
<p>D. $$\mathrm{Fe}^{2+}$$ reduces the persulphate ion</p>
<p>Ch... | [{"identifier": "A", "content": "B and C only\n"}, {"identifier": "B", "content": "A only\n"}, {"identifier": "C", "content": "A and D only\n"}, {"identifier": "D", "content": "B only"}] | ["C"] | null | <p>To determine the correct answer to this question, let's analyze the catalysis mechanism involving Iron (III) in the reaction between iodide ($$\mathrm{I^-}$$) and persulfate ($$\mathrm{S_2O_8^{2-}}$$) ions.</p>
<p>Iron (III), or $$\mathrm{Fe}^{3+}$$, can act as a catalyst by undergoing redox reactions, cycling betw... | mcq | jee-main-2024-online-8th-april-morning-shift | 1,943 |
lv7v4hdn | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>The metal that shows highest and maximum number of oxidation state is :</p> | [{"identifier": "A", "content": "Co"}, {"identifier": "B", "content": "Mn"}, {"identifier": "C", "content": "Fe"}, {"identifier": "D", "content": "Ti"}] | ["B"] | null | <p>The metal that shows the highest and maximum number of oxidation states among the options given is manganese (Mn), which is option B. Manganese exhibits a wide range of oxidation states from +2 to +7, which is more diverse than the other metals mentioned. To further detail:</p>
<ul>
<li><strong>Co (Cobalt)</strong... | mcq | jee-main-2024-online-5th-april-morning-shift | 1,944 |
lv9s2pr8 | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is _________.</p>
<p>$$\mathrm{Ti}^{2+}, \mathrm{Cr}^{2+} \text { and } \mathrm{V}^{2+}$$</p> | [{"identifier": "A", "content": "1"}, {"identifier": "B", "content": "2"}, {"identifier": "C", "content": "3"}, {"identifier": "D", "content": "0"}] | ["C"] | null | <p>To determine the ability of the ions to liberate hydrogen from a dilute acid, we need to understand the standard electrode potentials of these ions in comparison to hydrogen. The standard electrode potential of hydrogen ($$\mathrm{H}^{+}/\mathrm{H}_{2}$$) is set at 0 volts. Any metal ion with a negative standard red... | mcq | jee-main-2024-online-5th-april-evening-shift | 1,946 |
lvb2a2ec | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Arrange the following elements in the increasing order of number of unpaired electrons in it.</p>
<p>(A) $$\mathrm{Sc}$$</p>
<p>(B) $$\mathrm{Cr}$$</p>
<p>(C) $$\mathrm{V}$$</p>
<p>(D) $$\mathrm{Ti}$$</p>
<p>(E) $$\mathrm{Mn}$$</p>
<p>Choose the correct answer from the options given below :</p> | [{"identifier": "A", "content": "$$\n(\\mathrm{A})<(\\mathrm{D})<(\\mathrm{C})<(\\mathrm{B})<(\\mathrm{E})\n$$"}, {"identifier": "B", "content": "$$\n(\\mathrm{A})<(\\mathrm{D})<(\\mathrm{C})<(\\mathrm{E})<(\\mathrm{B})\n$$"}, {"identifier": "C", "content": "$$\n(\\mathrm{B})<(\\mathrm{C})<(\\mathrm{D})<(\\mathrm{E})<(... | ["B"] | null | <p>Electronic configuration of the given metals</p>
<p>(A) $$\mathrm{Sc} \Rightarrow 3 \mathrm{~d}^1 4 \mathrm{~s}^2 \Rightarrow \mathrm{n}=1$$</p>
<p>(B) $$\mathrm{Cr} \Rightarrow 3 \mathrm{~d}^5 4 \mathrm{~s}^1 \Rightarrow \mathrm{n}=6$$</p>
<p>(C) $$\mathrm{V} \Rightarrow 3 \mathrm{~d}^3 4 \mathrm{~s}^2 \Rightarrow ... | mcq | jee-main-2024-online-6th-april-evening-shift | 1,947 |
lvb2abeg | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Among $$\mathrm{VO}_2^{+}, \mathrm{MnO}_4^{-}$$ and $$\mathrm{Cr}_2 \mathrm{O}_7^{2-}$$, the spin-only magnetic moment value of the species with least oxidising ability is __________ BM (Nearest integer).</p>
<p>(Given atomic member $$\mathrm{V}=23, \mathrm{Mn}=25, \mathrm{Cr}=24$$)</p> | [] | null | 0 | <p>In order to determine the spin-only magnetic moment value of the species with the least oxidizing ability, we first need to analyze their oxidation states and electron configurations.</p>
<p>1. $$\mathrm{VO}_2^{+}$$:</p>
<p>For vanadium in $$\mathrm{VO}_2^{+}$$, the oxidation state is +5. The electronic configurat... | integer | jee-main-2024-online-6th-april-evening-shift | 1,948 |
lvc58eea | chemistry | d-and-f-block-elements | properties-of-transition-elements | <p>Among $$\mathrm{CrO}, \mathrm{Cr}_2 \mathrm{O}_3$$ and $$\mathrm{CrO}_3$$, the sum of spin-only magnetic moment values of basic and amphoteric oxides is _________ $$10^{-2} \mathrm{BM}$$ (nearest integer).</p>
<p>(Given atomic number of $$\mathrm{Cr}$$ is 24 )</p> | [] | null | 877 | <p>First, we need to understand the oxidation states of chromium in the given compounds and determine their magnetic moments based on their electronic configurations.</p>
<p>1. $$\mathrm{CrO}$$: In $$\mathrm{CrO}$$, the oxidation state of chromium is +2. The electronic configuration of chromium (Cr) is $$1s^2 2s^2 2p^... | integer | jee-main-2024-online-6th-april-morning-shift | 1,949 |
8wA5QcfJErs5YYwq | chemistry | electrochemistry | batteries,-fuel-cells-and-corrosion | Several blocks of magnesium are fixed to the bottom of a ship to : | [{"identifier": "A", "content": "make the ship lighter"}, {"identifier": "B", "content": "prevent action of water and salt"}, {"identifier": "C", "content": "prevent puncturing by under-sea rocks"}, {"identifier": "D", "content": "keep away the sharks"}] | ["B"] | null | Magnesium provides cathodic protection and prevent rusting or corrosion. | mcq | aieee-2003 | 1,950 |
Cq7eb3s671Jb9l1c | chemistry | electrochemistry | batteries,-fuel-cells-and-corrosion | In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to : | [{"identifier": "A", "content": "generate heat "}, {"identifier": "B", "content": "remove adsorbed oxygen from electrode surfaces "}, {"identifier": "C", "content": "produce high purity water"}, {"identifier": "D", "content": "create potential difference between the two electrodes"}] | ["D"] | null | In $${H_2} - {O_2}$$ fuel cell, the combustion of $${H_2}$$ occurs to create potential difference between the two electrodes | mcq | aieee-2004 | 1,951 |
OFxUwl1UpzGI2692 | chemistry | electrochemistry | batteries,-fuel-cells-and-corrosion | In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is<br/>
CH<sub>3</sub>OH(l) + 3/2O<sub>2 </sub> $$\to$$ CO<sub>2</sub> (g) + 2H<sub>2</sub>O (l) <br/>
At 298K standard Gibb’s energies of formation for CH<sub>3</sub>OH(l), H<sub>2</sub>O(l) and CO<sub>2</sub> (g) are -166.2, -... | [{"identifier": "A", "content": "87%"}, {"identifier": "B", "content": "90%"}, {"identifier": "C", "content": "97%"}, {"identifier": "D", "content": "80%"}] | ["C"] | null | $$C{H_3}OH\left( l \right) + {3 \over 2}{O_2}\left( g \right)$$
<br><br>$$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \to C{O_2}\left( g \right) + 2{H_2}O\left( l \right)$$
<br><br>$$\Delta {G_r} = \Delta {G_f}\left( {C{O_2},g} \right) + 2\Delta {G_f}\left( {{H_2}O,l} \right) - $$
<br><br>$$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\... | mcq | aieee-2009 | 1,952 |
JYJFqFkkk6669jFQ | chemistry | electrochemistry | batteries,-fuel-cells-and-corrosion | Galvanization is applying a coating of : | [{"identifier": "A", "content": "Cr"}, {"identifier": "B", "content": "Cu"}, {"identifier": "C", "content": "Zn"}, {"identifier": "D", "content": "Pb"}] | ["C"] | null | <b>Galvanization</b> is the process by which zinc is coated over corrosive (easily rusted) metals to prevent them from corrosion. | mcq | jee-main-2016-offline | 1,953 |
BDZrcHtJ0K9DBMLjx0tQD | chemistry | electrochemistry | batteries,-fuel-cells-and-corrosion | Identify the correct statement : | [{"identifier": "A", "content": "Iron corrodes in oxygen-free water."}, {"identifier": "B", "content": "Iron corrodes more rapidly in salt water because its electrochemical\npotential is higher."}, {"identifier": "C", "content": "Corrosion of iron can be minimized by forming a contact with another\nmetal with a higher ... | ["D"] | null | <p>The two conditions necessary for the corrosion of iron to take place are presence of moisture and oxygen. Factors that catalyse the process of rusting are the presence of carbon dioxide, acids and impurities. It can be minimised by introducing of a barrier film between surface of iron and atmosphere. This can be don... | mcq | jee-main-2016-online-10th-april-morning-slot | 1,954 |
wrvo2JTJ5c8kR6aM7R1kludnpno | chemistry | electrochemistry | batteries,-fuel-cells-and-corrosion | Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is : | [{"identifier": "A", "content": "PbO"}, {"identifier": "B", "content": "PbO<sub>2</sub>"}, {"identifier": "C", "content": "PbSO<sub>4</sub>"}, {"identifier": "D", "content": "Pb<sub>3</sub>O<sub>4</sub>"}] | ["B"] | null | PbO<sub>2</sub> is strong oxidizing agent because Pb<sup>+4</sup> is
not stable and can be easily reduced to Pb<sup>+2</sup>.<br><br>
PbO<sub>2</sub> is used in lead storage batteries. It is
also amphoteric in nature. | mcq | jee-main-2021-online-26th-february-morning-slot | 1,955 |
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