Question

O2+ is paramagnetic or diamagnetic?

Answer 1

Paramagnetic

Explanation:

We can work this out by looking at the molecular orbital diagram of `O_2`

`O_2^+` has 1 fewer electron than `O_2` which is what gives it the positive charge.

The electron would be removed from the `pi` orbital, as this is the highest in energy. Removing one electron from the `pi` orbital still leaves one unpaired electron in the other `pi`* orbital.

Since `O_2^+` has an unpaired electron it is paramagnetic.