$-5.45 \times 10^{-19}$ J

$-2.40 \times 10^{-19}$ J

$-4.35 \times 10^{-18}$ J

$-6.70 \times 10^{-18}$ J

$\text{H}_2\text{S} < \text{H}_2\text{Se} < \text{H}_2\text{Te}$

$\text{H}_2\text{Se} < \text{H}_2\text{S} < \text{H}_2\text{Te}$

$\text{H}_2\text{Te} < \text{H}_2\text{S} < \text{H}_2\text{Se}$

$\text{H}_2\text{Se} < \text{H}_2\text{Te} < \text{H}_2\text{S}$

$\text{Li}_2$

$\text{N}_2$

$\text{O}_2$

$\text{F}_2$

It shows deviation from Boyle's law and Charles' law.

Its molecules are not perfectly elastic.

It does not exist.

Intermolecular attraction is present in it, hence a collision takes place with loss of kinetic energy.