Question
Cuprous ion is colourless while cupric ion is coloured because
A.
both have half filled $$p$$ - and $$d$$ - orbitals.
B.
cuprous ion has incomplete $$d$$ - orbital and cupric ion has a complete $$d$$ - orbital.
C.
both have unpaired electrons in the $$d$$ - orbitals.
D.
cuprous ion has complete $$d$$ - orbital and cupric ion has an incomplete $$d$$ - orbital.
Answer :
cuprous ion has complete $$d$$ - orbital and cupric ion has an incomplete $$d$$ - orbital.
Solution :
In $$C{u^ + }\left[ {Ar} \right]3{d^{10}}$$ there is no unpaired electron, $$C{u^{2 + }}\left[ {Ar} \right]3{d^9}$$ contains one unpaired electron hence coloured.