JEE Main Chemistry question

Which of the following is correct for critical temperature?

(A)It is the lowest 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 compressionCorrect
(C)At critical temperature, the surface tension of the system is not zero
(D)At critical temperature, the gas and the liquid phases have different critical densities

Answer: (B)

Solution

Above the critical temperature, the liquid and vapour phases become indistinguishable (same density, no interface), so no amount of pressure can condense the gas into a separate liquid phase. In fact, at the critical point surface tension falls to zero (not "not zero"), and the

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Question ID VK-134105