Question

The temperature above which a gas cannot be liquefied, however great the pressure applied may be, is called

(a) vander Waal's temperature

(b) Boyle's temperature

(c) critical temperature

(d) inversion temperature

Answer 1

Correct option is (c) critical temperature

Temperature above which gas cannot be liquefied is called critical temperature, T_c. The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied.