Q83 / 180 · AIIMS 2016 · Chemistry

Assertion : Critical temperature of $\mathrm{CO}_2$ is $304 \mathrm{~K}$, it cannot be liquified above $304 \mathrm{~K}$. Reason : At a certain temperature, volume $\propto \frac{1}{\text { pressure }}$

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

Critical temperature of a gas may be defined as that temperature above which it cannot be liqufied however high pressure may be applied on the gas. Hence, $\mathrm{CO}_2$ cannot be liquified above its critical temperature. According to Boyle's law $P \propto \frac{1}{V}$ or $V \propto \frac{1}{P}$ (at constant $T$ and $\left.n\right)$

Hence, the correct answer is option: 'B'.

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