Question

Assertion:
Critical temperature of $C{O}_2$ is $304K$, it cannot be liquified above $304K$.
Reason:
At a certain temperature, $\text{Volume}\propto \frac{1}{\text{Pressure}}$

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> AIIMS 2016

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

Answer 1

The correct option is D Both assertion and reason are true but reason is not the correct explanation of assertion.

Critical temperature of a gas may be defined as that temperature above which it cannot be liquified however high pressure may be applied on the gas.
Hence, $C{O}_2$ cannot be liquified above its critical temperature.
According to Boyle’s law:
At a certain temperature, $\text{Volume}\propto \frac{1}{\text{Pressure}}$