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(A) The surface tension of a liquid arises due to the cohesive forces between molecules in the bulk and the surface. As the temperature of a liquid in

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zero

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(A) The surface tension of a liquid arises due to the cohesive forces between molecules in the bulk and the surface. As the temperature of a liquid increases,the kinetic energy of the molecules increases,which weakens the cohesive forces. At the critical temperature $(T_c)$,the distinction between the liquid phase and the vapor phase disappears,meaning the density of the liquid becomes equal to the density of its saturated vapor. Since the cohesive forces effectively vanish at this point,the surface tension of the liquid becomes $0$.

At critical temperature,the surface tension of a liquid is

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