Which of the following pairs is coloured in aqueous solution?

Options

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

Answer

B

Explanation

Both `Ni^(2+)(3d^(8))` and `Ti^(3+)(3d^(1))` have unpaired electrons, Therefore, these are coloured only in the case.