Question

Why Ni^2+ form tetrahedral complex with CO and square planar with CN?

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Answer 1

Answer:

* In presence of strong field CN- ions, all the electrons are paired up. The empty 4d, 3s and two 4p orbitals undergo dsp2 hybridization to make bonds with CN- ligands in square planar geometry. Thus [Ni(CN)4]2- is diamagnetic.

Explanation:

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Answer 2

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Why Ni^2+ form tetrahedral complex with CO and square planar with CN?

* In presence of strong field CN- ions, all the electrons are paired up. The empty 4d, 3s and two 4p orbitals undergo dsp2 hybridization to make bonds with CN- ligands in square planar geometry. Thus [Ni(CN)4]2- is diamagnetic.