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Question 850012
JEE Chemistry · Medium

States of Matter and Gaseous State: Mixed MCQ

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MixedMediumQuestion 850012

Question

The liquefaction of gases is achieved by:
  1. A
    Cooling below Tc and applying pressure above Pc
    Correct
  2. B
    Heating to above Tc
  3. C
    Reducing pressure only
  4. D
    Adding a catalyst

Correct answer

Cooling below Tc and applying pressure above Pc

Explanation

To liquefy a gas: (1) temperature must be below Tc (critical temperature), (2) pressure must exceed the vapour pressure at that temperature. The Linde process (Joule-Thomson expansion) and compression-cooling are used industrially.

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