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Question

Which of the following ions has the maximum magnetic moment?

A
Mn+2
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B
Fe+2
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C
Ti+2
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D
Cr+2
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Solution

The correct option is D Mn+2
Electronic configuration of Mn2+ = [Ar]3d5 & No. of unpaired electrons =5

Electronic configuration of Fe2+ = [Ar]3d6 & No. of unpaired electrons =4

Electronic configuration of Ti2+ = [Ar]3d2 & No. of unpaired electrons =2

Electronic configuration of Cr2+ = [Ar]3d4 & No. of unpaired electrons =4

Magnetic moment=n(n+2)B.M., where n is the number of unpaired electrons

Therefore, the maximum number of unpaired electrons are in Mn2+.

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