Onthe basis of valencebondtheory explain the structure andmagnetic nature of `[Ni(CN)_4]^(2-)` complex ion.

Explanation

In `[Ni(CN)_4]^(2-)`, Ni is present as Ni(II). The electronic configuration of Ni is [Ar] `3d^8 4s^2 4p^@` and Ni in + 2 oxidation state has electronic configuration `[Ar] 3d^8 4s^@ 4p^@`.

Now we know that `CN^(-)` is a strong field ligand so electron will pair up and hence its hybridisation is `dsp^2` and complex is diamagnetic.