1.

For the octahedral complex 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]

Answer»


Solution :Fe(26) = `3D^(6)4s^(2), Fe^(3+)=3d^(5)`
In `[Fe(CN)_(6)]^(3-), CN^(-)` is a strong field ligand which causes pairing of electrons

`mu=sqrt(n(n+2))=sqrt(1(1+2))=sqrt(3)=1.732` BM
In `[Fe(SCN)_(6)]^(3-), SCN^(-)`being a weak field ligand does not cause pairing of electrons

`mu=sqrt(n(n+2))=sqrt(5(5+2))=sqrt(35)=5.916` BM
DIFFERENCE = 5.916 - 1.732 = 4.184 `-=` 4 BM


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