`[Ni(NH)_(4)]^(2-)` is diamagnetic but `[NiCl_(4)]^(2-)` is paramagnetic. Give the hybridisation of `Ni^(2+)` in the given complex ions.

Explanation

The hybridisation of `Ni^(2+)` in `[Ni(CN)_(4)]^(2-)` is `dsp^(2)` and the hybridisation of `Ni^(2+)` in `[NiCl_(4)]^(2-)` is `sp^(3)`.
`["Note: "Ni^(2+)" is a "d^(8)" system"]`