Hybridisation of Fe in `K_(3)[Fe(CN)_(6)] and K_(4)[Fe(CN)_(6)]` respectively are :

Options

A. `d^(2)sp^(3) and sp^(3)d^(2)`
B. `d^(2)sp^(3)and d^(2)sp^(3)`
C. `sp^(3)d^(2) and sp^(3)d^(2)`
D. `sp^(3)d^(2)and d^(2)sp^(3)`

Explanation

`CN^(-)` is strong field ligand, so `Delta_(0)gtP`. Hence `K_(3)[Fe(CN)_(6)]` ion `d^(2)sp^(3)` hybridisation and is diamagnetic. `K_(4)[Fe(CN)_(6)]` has `dsp^(3)` hybridisation and is paramagnetic with one unpaired electron.