Question

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.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

$\underset{–}{\text{Critical temperature}:}$

The temperature at or above which vapor of the substance can't be liquified, no matter how much pressure is applied.

$⟹$ The gases should be cooled down below their critical temperatures for their liquification. Upon cooling, the movement of molecules slow down. Therefore, the inter-molecular forces hold the slowly moving molecules together and thus, the gas liquifies.