Question

Among the following the paramagnetic compound is

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

Superoxide anion $\left(K{O}_2\right)$ is paramagnetic.
If we look at the options,
In case of $\left(K{O}_2\right)$, $\left(O_2^{-}\right)$ will have an unpaired electron which we make it paramagnetic.
In case of other three options, there will not be any unpaired electrons. Therefore they will be diamagnetic.