Different theories have been put forward to explain the geometrical of co-ordianation compounds. Out of them , the most practical is the valence bond theory which is based upon the concept of hybridisation . According to this , the complexes with C.N.4 may be either tetrahedral (`sp^(3)` hybridised ) or square planar (`dsp^(2)` hybridised ) in nature. Similarly , in the octahedral complexes , the metal atom or ion is either paramagnetic if one or more orbitals are half-filled and diamagnetic if all are filled in nature.
Which statements is incorrect ?

Options

A. `[Ni(CO)_(4)]` : Tetrahedral, paramagnetic
B. `[Ni(CN)_(4)]^(2-)` : Square planar , diamagnetic
C. `[Ni(CO)_(4)]` : Tetrahedral , diamagnetic
D. `[NiCl_(4)]^(2-)` : Tetrahedral , paramagnetic

Answer

c

Explanation

`[Ni(CO)_4]` is tetrahedral and diamagnetic in nature and not paramagnetic.