Wht will be the theoretical value of magnetic moment `(mu)` when `CN^(-)` ligands join `Fe^(3+)` ion to yield complex

Options

A. `2.83` BM
B. `3.87` BM
C. `5.92` BM
D. `1.73` BM

Answer

D

Explanation

Valence shell electronic configuration of `Fe^(3+)` :

`CN^(-)` is a strong field ligand, so it forms low spin complexes after pairing of electrons within 3d level.
Magnetic moment`=sqrt(n(n+2))` B.M.
`=sqrt(1(1+2))` B.M.
`=1.73`B.M.