The calculated spin only magnetic moment of Co2+ ion is
A
4.90BM
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B
5.92BM
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C
2.84BM
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D
3.87BM
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Solution
The correct option is D3.87BM Electronic configuration of Co→[Ar]3d74s2
Electronic configuration of Co2+→[Ar]3d7
Number of unpaired e−=3
Spin only magnetic moment =√n(n+2)BM =√3(3+2) =√15BM =3.87BM