Assertion : All the gases should be cooled below their critical temperature for liquification.
Reason : Cooling slows down the movement of molecules therefore, intermolecular forces may hold the slowly moving molecules together and the gas liquifies.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If both (A) and (R) are incorrect.

Answer

B

Explanation

Critical temperature of a gas is the highest temperature at which liquification of the gas first occurs. Above critical temperature, gas cannot be liquefied howsoever high pressure may be applied on the gas.