Question

Assertion (A) Critical temperature of $CO_2$ is $304 \,K$, it cannot be liquified above $304\,K$.
Reason (R) At a certain temperature,
Volume $\propto \frac{1}{\text{pressure}}$

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

Answer 1

Answer: (B)

Critical temperature of a gas may be defined as that temperature above which it cannot be liquefied however high pressure may be applied on the gas.
Hence, $CO _{2}$ cannot be liquefied above its critical temperature
According to Boyle's law
$p \propto \frac{1}{V}$ or $V \propto \frac{1}{p}($ at constant $T$ and $n$ )