Which of the following ions are coloured in solution?
Answer & explanation
Correct answer: option 4
V3+ is coloured in the solution because it contains unpaired electrons in (n-1)d shell which will help in d-d transition.
30Zn : [Ar]4s23d10 ; Zn2+ : [Ar]3d10
22Ti : [Ar]4s23d2 ; Ti4+ : [Ar]
29Cu : [Ar]4s13d10 ; Cu+ : [Ar]3d10
23V : [Ar]4s23d3 ; V3+ : [Ar]3d2