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Which of the following ions has the maximum value of the magnetic moment?
(At.no. V = 23, Mn = 25, Fe = 26, Ni = 28)

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V⁴⁺

Mn⁴⁺

Ni⁴⁺

Fe³⁺

answer is D.

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Detailed Solution

V⁴⁺ = 3d¹
Mn⁴⁺ = 3 d³
Ni²⁺ = 3 d⁸
Fe³⁺ = 3 d⁵
Max. no. of unpaired are with Fe³⁺ (n = 5)
$∴ μ = \sqrt{n (n + 2)} BM \Rightarrow \sqrt{35} BM = 5.92 BM$

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