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Question

The critical temperature of a gas is the temperature:


A

Above which it can no longer remain in the gaseous state

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B

Above which it cannot be liquified by pressure

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C

At which it solidifies

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D

At which the volume of the gas becomes zero

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Solution

The correct option is B

Above which it cannot be liquified by pressure


The explanation for the correct option:

Option (b) Above which it cannot be liquified by pressure

  • A material's critical temperature is defined as the greatest temperature at which the substance may exist as a liquid.
  • The material in consideration (in its vapour/gaseous condition) cannot be liquified at temperatures above the critical temperature, regardless of the amount of pressure applied to it.

The explanation for incorrect options:

Option (a) Above which it can no longer remain in the gaseous state

  • As it is clear from the graph that the material remains in the gaseous phase after critical temperature.
  • So, this option is incorrect.

Option (c) At which it solidifies

  • This option is incorrect.
  • As seen from the graph, the solid state remains way behind the critical temperature.

Option (d) At which the volume of the gas becomes zero

  • This option is also incorrect.
  • As the critical temperature is the maximum temperature at which a gas can be liquefied by pressure.

So, the correct option is (b) The critical temperature of a gas is the temperature above which it cannot be liquified by pressure.


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