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Q. Hybridisation and geometry of $[Ni(CN)_{4}]^{2-}$ are

KVPYKVPY 2017Coordination Compounds

Solution:

The oxidation state of $Ni$ in $[Ni(CN)_{4}]^{2-}$ is $+2.$ The electronic configuration of $Ni^{2+} is[Ar] 3d^{8} 4s^{0}.$
$\overset{Ni^{2+}}{\text{Ground state}}$ image
$AsCN^{-}$ is a strong field ligand, so it will pair up electrons
$[Ni(CN)_{4}]^{2-}$ image
The hybridisation of Ni in $[Ni(CN)_{4}]^{2-}$ is $dsp^{2}$ and thus, it will a square planar geometry
image