Question

A gas can be easily liquefied.

• A. when its inversion temperature equals the Boyle's temperature
• B. under reversible adiabatic expansion
• C. under pressure and above critical temperature
• D. at low pressure and above critical temperature

Answer 1

Answer: (B), (C)

The correct options are
B under reversible adiabatic expansion
C under pressure and above critical temperature

(i) Reversible adiabatic expansion lowers temperature hence facilitates the liquefaction of gas.
(ii) It can be liquefied below the critical temperature by increasing the pressure.