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Question

Magnetic moment μ=15 B.M. is the true for the pair:


A

Co2+,Cr3+

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B

Fe2+,Cr+3

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C

Fe+3,Fe+2

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D

Mn+2,Fe+2

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Solution

The correct option is A

Co2+,Cr3+


As spin only magnetic moment is μ=n(n+2) B.M., where n is the number of unpaired electrons.
According to the given magnetic moment, n = 3.
And among given ions Co2+(d7),Cr3+(d3) configuration has 3 unpaired electron .
So, the anwer is Co2+,Cr3+

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