(D) The critical temperature $(T_c)$ is defined as the temperature above which a gas cannot be liquefied,regardless of the pressure applied. At this t

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(D) The critical temperature $(T_c)$ is defined as the temperature above which a gas cannot be liquefied,regardless of the pressure applied. At this temperature,the density of the liquid phase becomes equal to the density of the vapour phase,meaning the meniscus between the two phases disappears. Consequently,the surface tension of the system becomes zero at the critical temperature. Therefore,all the given statements are correct.

Class 11 Chemistry States of Matter Critical state and Liquefaction of gases

Medium

Which of the following statements is correct regarding the critical temperature $(T_c)$?

A
It is the highest temperature at which liquid and vapour can coexist.
B
Beyond the critical temperature,there is no distinction between the two phases and a gas cannot be liquefied by compression.
C
At the critical temperature $(T_c)$,the surface tension of the system is zero.
D
All of the above.