Aqueous Cu+2 ions are blue in colour, where as aqueous Zn+2 ions are colourless. why?

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Aqueous Cu⁺² ions are blue in colour, where as aqueous Zn⁺² ions are colourless. why?

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Detailed Solution

Electronic configuration of Cu⁺² is [Ar] 4s⁰3d⁹. it contains one unpaired electron. Hence it exhibits blue colour in aqueous solution. Electronic configuration of Zn⁺² is [Ar]4s⁰3d¹⁰. Hence it is colourless.

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