A nickel salt solution containing $[N i (H_{2} O)_{6}]^{+}$ is green in color on addition of $K C N$ the green color disappears and the complex $[N i (C N)_{4}]^{-}$ is formed. Explain this observation.

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Solution

In ${[N i {(H_{2} O)}_{6}]}^{2 +}$ , there are unpaired $e^{-} s$ due to the unpairing of weak ligand $(H_{2} O)$ . These $e^{-} s$ make d-d transition and give colour to the compound. In ${[N i {(C N)}_{6}]}^{2 -}$ there is no unapaired electrons due to the pairing of electrons by strong ligand $({C N}^{-})$ . There is no free electron to make d-d transition, so there is no colour to the complex.

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