The critical temperature is the temperature

  1. A

    below which the gas undergoes cooling when expanded into a vacuum

  2. B

    at which a gas liquefies at 1 atm

  3. C

    at which the average kinetic energy of the molecules is minimum

  4. D

    above which the gas cannot be liquefied how so ever high pressure may be applied

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    Solution:

    The critical temperature is the temperature above which the gas cannot be liquefied how so ever high pressure may be applied

    The greatest temperature at which a material may exist as a liquid is known as a substance's critical temperature.

    Hence option (D) is the correct 

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