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Question

Give reason: Cu+ ion is colorless but Cu2+ ion is colored. Explain.

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Solution

Cu+ ion has an electronic configuration 3d10 whereas Cu2+ ion has an electronic configuration 3d9. Hence an unpaired electron is present in Cu2+ which makes electronic transition feasible in case of Cu2+ ion, thus imparting color. Due to lack of unpaired electrons, Cu+ is colorless

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