Which of the following pairs of ions is colourless?

Options

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

Answer

B

Explanation

`Se^(3+)` has ` 3d^(10)`configuration while `Zn^(2-)` has ` 3d^(10)` configguration . Hence these ions are colourless