What is the correct electronic configuration of the central atom in based on crystal field theory? [2019]

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Solution

Q.
What is the correct electronic configuration of the central atom in $K_{4} [Fe {(CN)}_{6}]$ based on crystal field theory [2019]

1 $e^{4} t_{2}^{2}$

2 $t_{2 g}^{4} e_{g}^{2}$

3 $t_{2 g}^{6} e_{g}^{0}$

4 $e^{3} t_{2}^{3}$

Ans.
(3)

In $K_{4} [Fe {(CN)}_{6}]$ complex, Fe is in +2 oxidation state.

As ${CN}^{-}$ is a strong field ligand, it causes pairing of electrons. Therefore, electronic configuration of ${Fe}^{2 +}$ in $K_{4} [Fe {(CN)}_{6}]$ is $t_{2 g}^{6} e_{g}^{0}$

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