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(C) The surface tension of a liquid decreases with an increase in temperature. As the temperature rises,the kinetic energy of the molecules increases,

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decreases

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(C) The surface tension of a liquid decreases with an increase in temperature. As the temperature rises,the kinetic energy of the molecules increases,which weakens the intermolecular cohesive forces responsible for surface tension. The surface tension of a liquid becomes zero at its boiling point and vanishes at the critical temperature. At the critical temperature,the intermolecular forces for liquids and gases become equal,and the liquid can expand without any restriction. For small temperature differences,the variation in surface tension with temperature is linear and is given by the relation: $T_{t} = T_{0}(1 - \alpha t)$,where $T_{t}$ and $T_{0}$ are the surface tensions at $t^{\circ}C$ and $0^{\circ}C$ respectively,and $\alpha$ is the temperature coefficient of surface tension.

With an increase in temperature,surface tension of liquid (except molten copper and cadmium)

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