Which one of the following ionic species will impact colour to an aqueous solutions?

Options

A. `Ti^(4+)`
B. `Cu^(+)`
C. `Zn^(2+)`
D. `Cr^(3+)`

Answer

D

Explanation

In `Ti^(4+),Cu^(+)` and `Zn^(2+)` , all have electrons paired so all the diamagnetic. `Cr^(3+)` with electrons configuration `[Ar]^(18) 3d^(3)` has three unpaired electrons. So it undergoes d-d transition of electrons in presence of ligands according to CFT and thus it is coloured.