Question

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.

• A. Both A and R are true and R is the correct expalanation of A.
• B. Both A and R are true but R is not the correct explanation of A.
• C. A is true but R is false.
• D. A is false but R is true.

Answer 1

The correct option is A Both A and R are true and R is the correct expalanation of A.

A real gas cannot be liquefied above critical temperature, even if we apply high pressure. Intermolecular forces of gas molecules are low above critical temperature because they escape due to high speed.
Therefore, both assertion and reason are correct and reason is correct explanation of assertion.