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.

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