Q80 / 180 · AIIMS 2009 · Chemistry

Assertion : Compressibility factor for hydrogen varies with pressure with positive slope at all pressure. Reason : Even at low pressure, repulsive forces dominate for hydrogen gas

  • 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

In case of $\mathrm{H}_2$, compressibility factor increases with the pressure. At $273 \mathrm{~K}, Z>1$ which shows that it is difficult to compress the gas as compared to an ideal gas. In this case, repulsive forces dominate.

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

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