Question

Which of the following is paramagnetic?

• A. $\mathrm{O}_2$
• B. $\mathrm{N}_2$
• C. $\mathrm{O}_2^{2-}$
• D. $\mathrm{H}_2$

Hint:

$\mathrm{O_2}$ is paramagnetic due to two unpaired electrons.

Answer 1

The Correct Option is A

Step 1: Conceptual Understanding:
Paramagnetic substances have unpaired electrons.
Step 2: Explanation in Detail:
$\mathrm{O_2}$ has two unpaired electrons in $\pi^*$ orbitals, hence paramagnetic.
Step 3: Therefore, Stating the Final Answer
$\mathrm{O}_2$ is paramagnetic.