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Question

Which of the following ions has the highest magnetic moment?

A
Fe2+
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B
Mn2+
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C
Cr3+
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D
V3+
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Solution

The correct option is B Mn2+
Fe2+[Ar]3d6

Mn2+[Ar]3d5

Cr3+[Ar]3d4

V3+[Ar]3d2

Clearly, Mn2+ has maximum number of unpaired electrons.
As, μs=n(n+2)B.M.
So, magnetic moment is directly proportional to number of unpaired electrons.
As, Mn2+ has maximum number of unpaired electrons, therefore, it has highest magnetic moment.

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