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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3rg099

Which of the following statements about liquefaction of gases are correct?

  1. AA gas below its critical temperature can be liquefied by compression alone
  2. BA gas above its critical temperature can be liquefied by sufficiently high pressure
  3. CThe Linde process uses the Joule-Thomson effect
  4. DThe Claude process uses adiabatic expansion of the gas against a piston to produce cooling

Answer: A, C, D

Below compression to the vapour pressure causes condensation (A true). Above no pressure can produce a distinct liquid phase (B false). The Linde method cools by throttling through a valve, i.e. the Joule-Thomson effect (C true). Claude's method lets the gas do external work in an adiabatic expansion, lowering its temperature more efficiently (D true).
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