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Question

Magnetic moment 2.83 BM is given by which of the following ions?
(At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

A
Ti3+
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B
Ni2+
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C
Cr3+
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D
Mn2+
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Solution

The correct option is B Ni2+
Magnetic moment is given by μ=n(n+2) B.M
[where n = no. of unpaired electrons]
When n = 2, then μ = 2.83 B.M.
For Ti3+(3d1),n=1;Cr3+(3d3),n=3
Ni2+(3d8),n=2Mn2+(3d5),n=5
Hence, Ni2+ has two unpaired electrons, with magnetic moment 2.83 B.M.

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