Cuprous ion is colourless, while cupric ion is coloured because (a)...

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Cuprous ion is colourless, while cupric ion is coloured because
(a) both have unpaired electrons in the \( d \)-subshell
(b) cuprous ion has a complete \( d \)-subshell and cupric ion has an incomplete \( d \)-subshell
(c) both have half-filled \( p \) - and \( d \)-subshell
(d) cuprous ion has incomplete \( d \)-subshell and cupric ion has a complete \( d \)-subshell
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