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Explain on the basis of V.B, theory that...

Explain on the basis of V.B, theory that `[Ni(CN)_4]^(2-)` ion with square planar structure is diamagnetic and the `[NiCl_4]^2-` ion with tetrahedral geometry is paramagnetic.

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[Ni(CN)_4]^(2-) has square planar structure and it is diamagnetic. Identify the ligand in the mentioned complex

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