$A$ real gas cannot be liquefied in which of the following conditions?

At what pressure does $SO_2$ gas liquefy at room temperature?

Which among the following gases is difficult to liquefy?

The critical temperatures for carbon dioxide $(CO_2)$ and methane $(CH_4)$ are $31.1 \, ^\circ C$ and $-81.9 \, ^\circ C$ respectively. Which of the following statements is correct regarding their liquefaction?

Ice,water,and steam coexist in equilibrium at which of the following conditions?

What will be the phase of $CO_2$ at critical pressure $P_C$ and temperatures of $13.1^{\circ}C$,$31.5^{\circ}C$,$50^{\circ}C$,and $30.98^{\circ}C$?