Explain : The compounds of Cu(II) are coloured. – InterviewSolution

1.	Explain : The compounds of Cu(II) are coloured.
Answer» The electronic configuration of ₂₉Cu [Ar] 3d¹⁰ 4s¹ and Cu²⁺ [Ar] 3d⁹. In copper compounds Cu²⁺ ions have incompletely filled 3d-orbital (3d⁹). Due to the presence of one unpaired electron in 3 d-orbital, Cu²⁺ ions absorb red light from visible spectrum and emit blue radiation due to d → d transition. Therefore, copper compounds are coloured.

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