Which among the following gases is difficult to liquify?
Which among the following gases is difficult to liquify?
$\mathrm{SO}_2$
$\mathrm{Cl}_2$
$\mathrm{NH}_3$
$\mathrm{O}_2$
Solution
Critical temperature $\left(\mathrm{T}_{\mathrm{c}}\right)$ of $\mathrm{O}_2$ is much below $0^{\circ} \mathrm{C}$ and its critical pressure $\left(\mathrm{P}_{\mathrm{c}}\right)$ value is also high. Consequently, it is difficult to liquify $\mathrm{O}_2$.