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Question

The spin-only magnetic moment value for the complex [Co(CN)6]4 is BM. [At. no. of Co = 27]

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Solution

In the given complex, oxidation state of Co is +2.
Configuration of Co2+ is 3d74s2
CN is strong field ligand and cause pairing of electrons.

(t2g)6(eg)1

Spin only magnetic moment (μ)=n(n+2)BM
n is number of unpaired electrons
μ=3=1.732 BM

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