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Question

The spin only magnetic moment of Fe in the complex [Fe(CN)6]3− in BM is:

A
1.414 BM
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B
1.73 BM
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C
2.82 BM
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D
2 BM
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Solution

The correct option is B 1.73 BM
In [Fe(CN)6]3, the oxidation state of Fe is +3 and the configuration is [Ar]3d5. As CN is a strong field ligand, there will be the pairing of electrons and only 1 electron will be unpaired.
n=1
μspin=n(n+2)=1(1+2)
=3=1.732=1.73 BM

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