Correct option is B $\mathrm{sp}^{3}, \mathrm{dsp}^{2}, \mathrm{sp}^{3}$ As CN $^{-}$is a strong ligand so here pairing happens and dsp $^{2}$ hybridisation (square planar) takes place while...
Among $[\mathrm{Ni}(\mathrm{CO}) 4],[\mathrm{Ni}(\mathrm{CN}) 4]^{2-}$ and $\left[\mathrm{NiCl}_{4}\right]^{2-}$ species, the hybridisation state of $\mathrm{Ni}$ atoms are respectively:
A $\quad s p^{3}, d s^{2} p, d s p^{2}$
B $\mathrm{sp}^{3}, \mathrm{~d} \mathrm{sp}^{2}, \mathrm{sp}^{3}$
C $\mathrm{sp}^{3}, \mathrm{sp}^{3}, \mathrm{~d} \mathrm{sp}^{2}$
D $\quad$ dsp $^{2}, \mathrm{sp}^{3}, \mathrm{sp}^{3}$
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