JEE Advanced Chemistry question

Cuprous ion is colourless while cupric ion is coloured because

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

Answer: (D)

Solution

(cuprous) has the configuration — a completely filled d-subshell, so no d-d transition is possible and it is colourless. (cupric) has — one hole/unpaired

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Question ID VK-159727