Describe for any two of the following complex ions , the type of hybridisation , shape and magnetic property.
(i) `[Fe(H_(2)O)_6]^(2+)` (ii) `[Co(NH_3)_6]^(3+)` (iii) `[NiCl_4]^(2-)`

Explanation

(i) `Fe(H_(2)O)_(6)]^(2+)` -outer orbital (high spin) complex-`sp^(3)d^(2)` hybridisation, octahedral, diamagnetic.
(ii) `[Co(NH_(3))_(6)]^(3+)` - inner orbital (low spin) complex- `d^(2)sp^(3)` hybridisation, octahedral, diamagnetic.
(iii) `[NiCl_(4)]^(2-)-sp^(3)`, (Electrons pair up as `NH_(3)` is a strong ligand) tetrahedral, paramagnetic.