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Q. Which of the following species represent the example of $dsp^2$ -hybridization ?

ManipalManipal 2002Coordination Compounds

Solution:

In $Fe(CN)_6]^{3-}$, and $[FeF_6]^{3-}$ there are six ligands, as such $dsp^2$-hybridisation is not possible.
For structure of $[Ni(CN)_4]^{2-}$, see hint to Q. 27 above. In it the state of hybridisation of $Ni^{2+}$ is $dsp^2$.
In $[Zn(NH_3)_4]^{2-} \, ,Zn^{2+}$ has configuration of $[Ar]^{18} \,3d^{10}$. Thus $dsp^2$-hybridisation is not possible