Which of the following species represent the example of $d s p^{2}$ -hybridisation?

{[F e {(C N)}_{6}]}_{6}^{3 -}

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{[N i {(C N)}_{4}]}_{4}^{2 -}

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{[Z n {(N H_{3})}_{4}]}_{4}^{2 +}

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{[F e F_{6}]}_{6}^{3 -}

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Solution

The correct option is B ${[N i {(C N)}_{4}]}_{4}^{2 -}$
${[N i {(C N)}_{4}]}_{4}^{2 -}$ exhibit $d s p^{2}$ geometry and hence sqaure planar geometry. Due to strong field ligand $C N^{-}$ electrons get paired in $3 d$ orbitals.

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