Q.

A gas can be liquefied

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a

at  its critical temperature

b

above its critical temperature

c

below is critical temperature

d

at any temperature

answer is C.

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Detailed Solution

  • A gas can be liquefied by cooling and compressing.
  • During cooling, the temperature of the gas is lowered and during compression, the pressure on the gas is increased.
  • A gas can be liquefied by pressure, only if it is at or below its characteristic temperature called critical temperature.
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