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Question: Answered & Verified by Expert
Assertion : Compressibility factor for hydrogen varies with pressure with positive slope at all pressures.
Reason : Even at low pressures, repulsive forces dominate hydrogen gas.
ChemistryStates of MatterAIIMSAIIMS 2005
Options:
  • 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:
2211 Upvotes Verified Answer
The correct answer is: If both assertion and reason are true and reason is the correct explanation of assertion
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 ideal gas. In this case repulsive forces dominate.

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