out of cu2+ and cu+ ion which one is colourless and why

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Solution

Dear Student,
Electronic configuration of Cu⁺ is [Ar]¹⁸ 3d^10.It has no unpaired electrons. Whereas electronic configuration of Cu²⁺ is [Ar]¹⁸ 3d⁹. Transition metals exhibit colours due to d-d transitions. d-d transitions occurs only when there is unpaired d electrons present or there is a vacancy in d subshell. So d-d transitions are not possible in case of Cu⁺, hence it is colourless. Whereas Cu²⁺have partially filled d- orbital and an unpaired d electron, thus d-d transition can take place, and it exhibits colour.

Regards
Rashmi Sheokand

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