[Cu(CN)_4]^{2-} is colourless as it absorbs l | vedclass

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(B) The complex $[Cu(CN)_4]^{2-}$ involves $Cu^{2+}$ ion,which has a $3d^9$ electronic configuration.However,in this specific complex,the $Cu^{2+}$ io

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Ultraviolet region

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(B) The complex $[Cu(CN)_4]^{2-}$ involves $Cu^{2+}$ ion,which has a $3d^9$ electronic configuration.However,in this specific complex,the $Cu^{2+}$ ion is reduced by the $CN^-$ ligand to $Cu^+$,which has a $3d^{10}$ configuration.Since the $3d$ subshell is completely filled $(d^{10})$,there are no unpaired electrons available for $d-d$ transitions.Consequently,it does not absorb light in the visible region,making it colourless.It absorbs light in the ultraviolet region due to charge transfer or other electronic transitions.

$[Cu(CN)_4]^{2-}$ is colourless as it absorbs light in

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