Q. Cuprous ion is colourless, while cupric ion is coloured because
A) Both have half-filled $p$ and $d$-orbiatls
B) Cuprous ion has a completed $d$-orbital and cupric ion has incomplete $d$-orbital
C) Cuprous ion has incomplete $d$-orbital and cupric ion has a complete $d$-orbital
D) Both have unpaired electrons in $d$-orbital
Explanation
(b)
Cuprous ion $\left( Cu^{+} \right)3d^{10}$ (completely filled $d$-subshell)
$3d^{10}$
[table] ⥮ | ⥮ | ⥮ | ⥮ | ⥮ [/table]
Cupric ion $\left( Cu^{2 +} \right)3d^{9}$ (one unpaired electron)
$3d^{9}$
[table] ⥮ | ⥮ | ⥮ | ⥮ | $\upharpoonleft$ [/table]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.