In which of thc following pairs are both the ions coloured in aqueous solution ? (At no: Sc=21, Ti=22, Ni=28, Cu=29, Co=27)

Options

A. `Ni^(2+),Cu^(+)`
B. `Ni^(2+),Ti^(3+)`
C. `Sc^(3+),Ti^(3+)`
D. `Sc^(3+),Co^(2+)`

Answer

B