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For the octahedral complexes of Fe^(3+) ...

For the octahedral complexes of `Fe^(3+)` in `SCN^(-)` (thiocyanato -S) and in `CN^(-)` ligand environments, the difference between the spin only magnetic moments in Bohr magnetons (when approximated to the nearest integer) is [atomic number of `Fe = 26` ]

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The correct Answer is:
4
`SCN^(-)` is weak field effect (WFE) ligand whereas `CN^(-)` is strong field effect (SFE) ligand.

Spin only magnetic moment `= sqrt(5(5+2))= sqrt(35) BM`

Spin only magnetic moment `= sqrt(1(1+2)) = sqrt(3) `BM
Difference `= sqrt( 35) - sqrt(3) ~=4`
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