1.

Why a solution of [Ni(H2O)5]2+ is green while a solution of [Ni(CN)4]2- is colourless? (At. No. of Ni = 28)

Answer»

Unpaired electrons in [Ni(H2O6]2+/d-d transition.

Detailed Answer:

[Ni(CN)4]2- has no unpaired electron in its d-subshell therefore d-d transition is not possible whereas [Ni(H2O)6]2+ has unpaired electron in its d-subshell resulting in d-d transition imparting colour.



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