question_answer 1)

  Assertion (A): Gases do not liquefy above their critical temperature, even on applying high pressure. Reason (R): Above critical temperature, the molecular speed is high and intermolecular attractions cannot hold the molecules together because they escape because of high speed.

Answer:

  (a) According to Andrews, a real gas can not be liquefied above critical temperature, whatever the pressure is applied. Intermolecular force of gas molecules is low above critical temperature.