For the octahedral complexes of $F e^{3 +}$ in $S C N^{-}$ (thiocyanato –S) and in $C N^{-}$ ligand environments, the difference between the spin only magnetic moments in Bohr magnetons (when approximated to the nearest integer) is: [Atomic number Fe = 26]

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Detailed Solution

$S C N^{-}$ is a weak acid ligand while $C N^{-}$ is a strong ligand. $F e^{3 +}$ Configuration is $[A r] 3 d^{5} .$ For weak ligand, $t_{2 g}^{3} e_{g}^{2}$ i.e, n=5 Mag.moment $= \sqrt{5 (5 + 2)} B M$

For strong ligand, $t_{2 g}^{5} e_{g}^{0},$ i.e., n=1 Mag.moment $= \sqrt{3} B M$

Difference $= \sqrt{35} - \sqrt{3} = 4$

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