In potassium ferrocyanide,there are ......... | vedclass

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Question

(B) The chemical formula for potassium ferrocyanide is $K_4[Fe(CN)_6]$.In this complex,the iron is in the $+2$ oxidation state: $Fe^{+2} = [Ar] 3d^6$.

Vedclass · Accepted Answer

$3$

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(B) The chemical formula for potassium ferrocyanide is $K_4[Fe(CN)_6]$.In this complex,the iron is in the $+2$ oxidation state: $Fe^{+2} = [Ar] 3d^6$.The ligand $CN^-$ is a strong field ligand $(SFL)$,which causes pairing of electrons in the $d$-orbitals.According to Crystal Field Theory for an octahedral complex,the $d$-orbitals split into $t_{2g}$ and $e_g$ sets.For $d^6$ configuration with a strong field ligand,all $6$ electrons occupy the $t_{2g}$ orbitals: $t_{2g}^6 e_g^0$.Since there are $6$ electrons in the $t_{2g}$ set,they form $6/2 = 3$ pairs of electrons.

In potassium ferrocyanide,there are $..........$ pairs of electrons in the $t_{2g}$ set of orbitals.

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