Question

Both $\left[Ni{\left(CO\right)}_4\right]$ and ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$ are diamagneitc. The types of hybridisation of $Ni$ in these complexes are ______ and ______ respectively.

• A. ${sp}^3,{dsp}^3$
• B. ${sp}^3,{dsp}^2$
• C. ${dsp}^2,{sp}^3$
• D. ${dsp}^2,{dsp}^2$

Answer 1

The correct option is A ${sp}^3,{dsp}^3$

$Ni(CO{)}_4$ has $N_i\left(O\right)\to d^8{S}^2\to d^{10}{s}^o{p}^o\to d^{10}s{p}^3$ since $CO$ is strong field ligand, it cause pairing of $S^2$ electron to $d^{10}{s}^o$ and hence $4Co$ contribute to $S{p}^3$

$\left[Ni\right(CN{)}_4{]}^{2-}\to N{i}^{2+}\to d^8\to$(refer to image) $CN$ is also strong field ligand.