Which one of the following ions is colourless in aqueous solution ?

Options

A. `Ti^(3+)`
B. `Cu^(2+)lt Cr^(2+)ltV^(2+)ltMn^(2+)`
C. ` Ni^(2+)`
D. ` Zn^(2+)`

Answer

(d)

Explanation

`Zn^2+` is colourless because of the completely filled d- oribital .