Question

The temperature to which a gas must be cooled before it can be liquefied by pressure alone is called its

• A. Critical temperature
• B. Saturation point
• C. Boiling point
• D. Freezing point

Answer 1

The correct option is A Critical temperature

$Answer:-$ A

In this P-V curve the isotherm having $T_c$ is that critical temperature and corresponding to that there is critical pressure $P_c$ .

Critical temperature is the temperature of a gas in its critical state, above which it cannot be liquefied by pressure alone.

Critical pressure is the pressure of a gas or vapour in its critical state.