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A solution [Ni(H2O)6]^(2+) is green whil...

A solution `[Ni(H_2O)_6]^(2+)` is green while a solution of `[Ni(CN)_4]^(2-)` is colourless. Explain.

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Which is correct in the case of [Ni(CN)_4]^(2-) complex :

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