question_answer

Cuprous ion is colourless, while cupric ion is coloured because [EAMCET 1992; BHU 2002]

A) Both have unpaired electrons in \[d\]-orbital

B) Cuprous ion has a completed \[d\]-orbital and cupric ion has an incomplete \[d\]-orbital

C) Both have half-filled \[p\]and \[d\]-orbitals

D) Cuprous ion has incomplete \[d\]-orbital and cupric ion has a completed \[d\]-orbital

Correct Answer: B

Solution :

Cuprous ion \[(C{{u}^{+}})\] \[3{{d}^{10}}\] Completely filled d sub shell Cupric ion \[C{{u}^{+2}}\] One unpaired electron