If Hund's rule is not followed then which of the following ion is paramagnetic,

Options

A. `Cr^(2+)`
B. `Fe^(2+)`
C. `Rh^(+3)`
D. `MnO_(4)^(2-)`

Answer

D

Explanation

In `MnO_(4)^(2-)` ion `Mn^(+6)` so it has one unpaired electron and it is paramagnetic.