In the inner orbital complex ion, `[Ni(CN_(4))]^(2-)`, give:
(1) the type of hybridisation in `Ni^(2+)`
(2) the orbitals involved in hybridisation.

Explanation

Coordination number of `Ni` in the given ion = 4.
It is an inner orbital complex and hence, it has a square planar geometry.
(1) Type of hybridisation in `Ni^(2+)=dsp^(2)`.
(2) The orbitals involved in hybridisation : `3d, 4s and 4p`.