The spin-only magnetic moment value for the c | vedclass

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(B) For the complex $[Co(CN)_6]^{4-}$,let the oxidation state of $Co$ be $x$.$x + 6 	imes (-1) = -4 \implies x = +2$.Electronic configuration of $Co^

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$2$

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(B) For the complex $[Co(CN)_6]^{4-}$,let the oxidation state of $Co$ be $x$.$x + 6 	imes (-1) = -4 \implies x = +2$.Electronic configuration of $Co^{2+}$ $(Z=27)$ is $[Ar] 3d^7$.In the presence of a strong field ligand like $CN^-$,the electrons in the $3d$ orbital undergo pairing.For $3d^7$,the distribution is $t_{2g}^6 e_g^1$,which leaves $n = 1$ unpaired electron.The spin-only magnetic moment is given by $\mu = \sqrt{n(n+2)} \ BM$.Substituting $n=1$,we get $\mu = \sqrt{1(1+2)} = \sqrt{3} \approx 1.73 \ BM$.The nearest integer value is $2 \ BM$.

The spin-only magnetic moment value for the complex $[Co(CN)_6]^{4-}$ is $...... \ BM$ [At. no. of $Co=27$]

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