Match List-I with List-II List-I Species List-II Electronic distribution --- --- (A) C r +2 (I) 3 d 8 (B) M n + (II) 3 d 3 4 s 1 (C) N i +2 (III) 3 \!\! \!\! d 4 (D) V + (IV) 3 \!\! \!\! d 5 4 \!\! \!\! s 1 Choose the correct answer from the options given below:

(A)-III, (B) - IV, (C) - I, (D)-II

Chemistry · d and f Block Elements

JEE Main 2024 — 30 January, Shift 1 — Question 65

Match List-I with List-II

List-I Species	List-II Electronic distribution
(A) $\text{C}{{\text{r}}^{+2}}$	(I) $3{{d}^{8}}$
(B) $\text{M}{{\text{n}}^{+}}$	(II) $3{{d}^{3}}4{{s}^{1}}$
(C) $\text{N}{{\text{i}}^{+2}}$	(III) $3\text{ }\!\!~\!\!\text{ }{{\text{d}}^{4}}$
(D) ${{\text{V}}^{+}}$	(IV) $3\text{ }\!\!~\!\!\text{ }{{\text{d}}^{5}}4\text{ }\!\!~\!\!\text{ }{{\text{s}}^{1}}$

Choose the correct answer from the options given below:

Option A:
(A)-I, (B)-II, (C)-III, (D)-IV
Option B:
(A)-III, (B) - IV, (C) - I, (D)-II
Correct
Option C:
(A)-IV, (B)-III, (C)-I, (D)-II
Option D:
(A)-II, (B)-I, (C)-IV, (D)-III

Answer: B

Step-by-step solution

$\quad{ }_{24} \mathrm{Cr} \rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1} ; \mathrm{Cr}^{2+} \rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{4}$

$\begin{matrix}{{~}_{25}}\text{Mn}\to \left[ \text{Ar} \right]3\text{ }\!\!~\!\!\text{ }{{\text{d}}^{5}}4\text{ }\!\!~\!\!\text{ }{{\text{s}}^{2}};\text{M}{{\text{n}}^{+}}\to \left[ \text{Ar} \right]3\text{ }\!\!~\!\!\text{ }{{\text{d}}^{5}}4\text{ }\!\!~\!\!\text{ }{{\text{s}}^{1}} \\{{~}_{28}}\text{Ni}\to \left[ \text{Ar} \right]3\text{ }\!\!~\!\!\text{ }{{\text{d}}^{8}}4\text{ }\!\!~\!\!\text{ }{{\text{s}}^{2}};\text{N}{{\text{i}}^{2+}}\to \left[ \text{Ar} \right]3\text{ }\!\!~\!\!\text{ }{{\text{d}}^{8}} \\{{~}_{23}}\text{ }\!\!~\!\!\text{ V}\to \left[ \text{Ar} \right]3\text{ }\!\!~\!\!\text{ }{{\text{d}}^{3}}4\text{ }\!\!~\!\!\text{ }{{\text{s}}^{2}};{{\text{V}}^{+}}\to \left[ \text{Ar} \right]3\text{ }\!\!~\!\!\text{ }{{\text{d}}^{3}}4\text{ }\!\!~\!\!\text{ }{{\text{s}}^{1}} \\\end{matrix}$

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Exam: JEE Main 2024
Paper: 30 January, Shift 1
Subject: Chemistry
Chapter: d and f Block Elements
Topic: Introduction and Properties of Transition Elements

Diamagnetic Lanthanoid ions are:

Answer: B

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