Which is diamagnetic in nature?

The correct option is D

${\mathrm{H}}_2$

Diamagnetic

Diamagnetic materials in chemistry means that they don't have any unpaired electrons.

Explanation for Correct answer

d)${\mathrm{H}}_2$

• Two Hydrogen atoms have one electron each in their valence shell.
• When both of the H-atoms are paired together, they have no unpaired or free electrons which is why ${\mathrm{H}}_2$ molecule is diamagnetic in nature.

Wrong answer

a) ${{\mathrm{H}}_2}^{–}$

• There are 3 electrons in this molecule, which is why there is 1 free electron. Hence, it is not diamagnetic.

b) ${{\mathrm{H}}_2}^{+}$

• There are 1 electron in this molecule, it has 1 free electron. Hence, it is not diamagnetic.

c) ${{\mathrm{He}}_2}^{+}$

• There are 3 electrons in this molecule, it has 1 free electron. Hence, it is not diamagnetic.

Hence, option D is correct.