How would you account for the magnetic behaviour of `[Fe(CN)_(6)]^(3-) and [Fe(CN)_(6)]^(4-)` ?

Explanation

`[Fe(CN)_(5)]^(3-)`.- involves`d^(2)sp^(3)`hybridisation
One 3d orbital is singly occupied, hence it is weakly paramagnetic in nature.
` [Fe(CN)_(6)]^(4-)` involves also `d^(2)sp^(3)` hybridisation but it has `Fe^(2+)` ion as central ion
it has no unpaired electron, hence it is diamagnetic in nature.