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Valence Bond Theory (VBT)Coordination Compounds

Why is [NiCl4]2−[NiCl_4]^{2-} paramagnetic while[Ni(CO)4] [Ni(CO)_4]is diamagnetic?

Expert Answer

Cl−Cl^- is a weak ligand (no pairing, sp3sp^3 , unpaired e−e^- ). COCO is strong (pairing, sp3sp^3 , no unpaired e−e^- ).

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