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Which of the following complexes is an example of dsp2 hybridisation?

1. [Fe(CN)6]3-
2. [Ni(CN)4]2-
3. [Ag(CN)2]-
4. [Co(CN)6]3-

Correct answer: [Ni(CN)4]2-

Solution

dsp2 hybridisation gives square-planar geometry. [Ni(CN)4]2- has Ni(II) (d8) with the strong-field CN- causing pairing and one (n-1)d orbital becoming available, giving dsp2 square planar. [Fe(CN)6]3-, [Co(CN)6]3- are d2sp3 octahedral and [Ag(CN)2]- is sp linear.

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