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(A) In $K_3[Fe(CN)_6]$,the oxidation state of $Fe$ is $+3$. Electronic configuration of $Fe^{3+}$ is $[Ar] 3d^5$. Since $CN^-$ is a strong field ligan

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(A) In $K_3[Fe(CN)_6]$,the oxidation state of $Fe$ is $+3$. Electronic configuration of $Fe^{3+}$ is $[Ar] 3d^5$. Since $CN^-$ is a strong field ligand,pairing occurs,resulting in $t_{2g}^5 e_g^0$ configuration with $1$ unpaired electron. In $K_4[Fe(CN)_6]$,the oxidation state of $Fe$ is $+2$. Electronic configuration of $Fe^{2+}$ is $[Ar] 3d^6$. Due to the strong field ligand $CN^-$,pairing occurs,resulting in $t_{2g}^6 e_g^0$ configuration with $0$ unpaired electrons.

Indicate the number of unpaired electrons in $K_3[Fe(CN)_6]$ and $K_4[Fe(CN)_6]$.

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