Which one of the following transition metal ions is paramagnetic?

Options

A. `Ag^+`
B. `Cu^(2-)`
C. `Zn^(2+)`
D. `Cd^(2+)`

Answer

B

Explanation

`Cu^(2+)` has `d^9` configuration with one unpaired electron and is paramagnetic whereas `Ag^(+) , Zn^(2+) ` and `Au^+` have `d^10` configuration and are diamagnetic