Which one of the following transition metal ions is diamagnetic?

Options

A. `Co^(2-)`
B. `Ni^(2+)`
C. `Cu^(2+)`
D. `Zn^(2+)`

Answer

D

Explanation

`Zn^(2+)` has `d^10` configuration where all electrons are paired and is diamagnetic . All other ions are paramagnetic