The temperature above which a gas cannot be liquefied is called as

Options

(a) inversion temperature
(b) critical temperature
(c) neutral temperature
(d) Curie point

Correct Answer:

critical temperature

Explanation:

Critical temperature (Tc) of a gas is defined as temperature above which it cannot be liquefied irrespective of pressure applied.
Critical pressure (Pc) of the gas is the pressure required by the gas at the Tc. Critical volume, (Vc) is the volume occupied by one mole of a gas at its Tc and Pc.