False Potassium ferrocyanide `[Fe^(+2)(CN)_(6)]^(4-)` is diamagnetic but potassium ferricyanide `K_(3)[Fe^(+3)(CN)_(6)]^(3-)`
is paramagnetic
`Fe^(+2) =3d^(6),CN^(Θ)` is a strong ligand so pairing occurs and have no unpaired electrons. Hence diamagnetic
`Fe^(+3) =3d^(5)`, pairing occurs and have one unpaired electron So paramagnetic .