JEE Main Chemistry question

Cuprous ion is colourless, while cupric ion is coloured because

(A)Both have half-filled and -orbitals
(B)Cuprous ion has a completed -orbital and cupric ion has incomplete -orbitalCorrect
(C)Cuprous ion has incomplete -orbital and cupric ion has a complete -orbital
(D)Both have unpaired electrons in -orbital

Answer: (B)

Solution

(completely filled -subshell, no unpaired electrons, colourless);

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Question ID VK-147387