Explain the geometry and hybridisation of [Ni(CN)4]2-????

In [Ni(CN)4]2-, Ni is in +2 oxidation state.
Orbital configuration:

In presence of CN- ligands, pairing of 3d electrons takes place to give following configuration:

The four vacant orbitals; one 3d, one 4s and two 4p orbitals hydrize to give four dsp2 hybrid orbitals which are used by four CN- ions for bond formation.

Hence, [Ni(CN)4]2- has dsp2 hybridization and square planar geometry.


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