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.
