Which of the following ions are paramagnetic in character?

Options

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

Answer

C

Explanation

`Zn^(2+): [Ar]^(18) 3d^(10), Ag^(+) : [Kr]^(36)4d^(10)`
`Cu^(+): [Ar]^(18)3d^(10), Ni^(2+): [Ar]^(18)3d^(8)`
As such `Ni^(2+)` has two unpaired electrons and is paramagnetic