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Question

which of the following complex ion is not expected to absorb visible light [Ni(H2O)6]^+2 or [Ni(CN)4]^-2 ?explain in detail

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Solution

Hi,NiH2O6+2 is a coordination compound in which central atom is surrounded by weak field ligand so pairing of electrons will not takes place.NiCN42- is a coordination compound in which central atom is surrounded by strong field ligand so pairing of electrons will takes place. There is no unpaired electrons in coordination compound NiCN42- so it do not absorbs light in visible region.Regards

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