MHT CET 2023 Physics question

At critical temperature, the surface tension of liquid is

(A)zeroCorrect
(B)infinity
(C)unity
(D)same as that at any other temperature

Answer: (A)

Solution

Surface tension decreases as temperature rises, because the cohesive forces between molecules weaken as their kinetic energy increases. At the critical temperature the distinction between the liquid and vapour phases disappears, the meniscus (liquid surface)

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Question ID VK-095120