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Cuprous ion is colourless, while cupric ion is coloured because

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

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

both have unpaired electrons in the d-subshell

both have half-filed p-and d-subshell

answer is B.

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Detailed Solution

Cuprous ions (Cu+) is colorless because it has no unpaired electrons in the 3d sub-shell since it has 3d10 configuration. The cupric ion (Cu+2) has one unpaired electron as it has configuration 3d9, after losing the electron to form +2.

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