Chemistry · d and f Block Elements

JEE Main 2024 — 30 January, Shift 1 — Question 60

Diamagnetic Lanthanoid ions are:

Option A:
$\mathrm{Nd}^{3+}$ and $\mathrm{Eu}^{3+}$
Option B:
$\mathrm{La}^{3+}$ and $\mathrm{Ce}^{4+}$
Correct
Option C:
$\mathrm{Nd}^{3+}$ and $\mathrm{Ce}^{4+}$
Option D:
$\mathrm{Lu}^{3+}$ and $\mathrm{Eu}^{3+}$

Answer: B

Step-by-step solution

$\mathrm{Ce}:[\mathrm{Xe}] 4 \mathrm{f}^{1} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2} ; \mathrm{Ce}^{4+}$ diamagnetic

$\mathrm{La}:[\mathrm{Xe}] 4 \mathrm{f}^{0} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2} ; \mathrm{La}^{3+}$ diamagnetic

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 30 January, Shift 1
Subject: Chemistry
Chapter: d and f Block Elements
Topic: Inner transition elements (f-Block elements)

Match List-I with List-II List-I Species List-II Electronic distribution --- --- (A) C r^+2 (I) 3d^8 (B) M n^+ (II) 3d^34s^1 (C) N i^+2…

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