Q46 / 180 · AIIMS 2008 · Chemistry

Assertion : Liquid \(\mathrm{NH}_3\) is used for refrigeration. Reason : Liquid \(\mathrm{NH}_3\) quickly vapourises.

  • Correct answer
    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • 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

Liq. $\mathrm{NH}_3$ has high heat of vaporisation (327 $\mathrm{cal} / \mathrm{g})$. So, it takes up lots of heat and helps in cooling. So, it is used in ice-plants.

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

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