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Question

For the octahedral complexes of Fe3+ in SCN(thiocyanato-S) and in CN ligand environments, the difference between the spin-only magnetic moment in BM (when approximated to the nearest integer) is
[Atomic number of Fe=26]

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Solution

SCN is weak field effect (WFE) ligand whereas CN is strong field effect (SFE) ligand.
Spin only magnetic moment =5(5+2)=35 BM
Spin only magnetic moment =1(1+2)=3 BM
Difference =3534

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