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Cuprous ion is colourless, while cupric ion is coloured because

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both have unpaired electrons in the d- subshell

cuprous ion has a complete d-subshell and cupric ion has an incomplete d-subshell

both have half-filed p-and d-subshell

cuprous ion has incomplete d-subshell and cupric ion has complete d-subshell

answer is B.

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Detailed Solution

₂₉Cu [Ar]4s¹3d¹⁰

Cu⁺¹[Ar]4s⁰3d¹⁰ (Cuprous) and Cu⁺² [Ar]4s⁰3d⁹(Cupric ion)

cuprous ion has complete d-subshell so colour less and cupric ion has incomplete d-subshell so coloured.

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