NEET 2024 — Chemistry solution

NEET2024Chemistry

'Spin only' magnetic moment same for which of the following ions?

A. Ti $^{3 +}$ B. Cr $^{2 +}$ C. Mn $^{2 +}$ D. Fe $^{2 +}$ E. Sc $^{3 +}$

Choose the most appropriate answer from the options given below:

A
B and C only
B
A and D only
C
B and D only
D
A and E only

Solution

Count unpaired electrons in each $d$ configuration: Ti $^{3 +}$ ( $d^{1}$ , 1), Cr $^{2 +}$ ( $d^{4}$ , 4), Mn $^{2 +}$ ( $d^{5}$ , 5), Fe $^{2 +}$ ( $d^{6}$ , 4), Sc $^{3 +}$ ( $d^{0}$ , 0).

$μ = n (n + 2)$ BM, so Cr $^{2 +}$ and Fe $^{2 +}$ both have 4 unpaired electrons and hence the same spin-only moment.

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