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MHT CET202619 April 2026Evening ShiftPhysicsMechanical Properties of FluidsActual

In most liquids, with rise in temperature surface tension of liquid

Options

  1. Adecreases
  2. Bincreases
  3. Cremains unchanged
  4. Dfirst decreases and then increases

Correct answer

A. decreases

Step-by-step solution

Surface tension of a liquid arises due to the intermolecular cohesive forces between its molecules. As the temperature of the liquid increases, the kinetic energy of the molecules increases. This increased thermal agitation causes the intermolecular distance to increase, which in turn weakens the cohesive forces between the molecules. Due to the decrease in cohesive forces, the surface tension of the liquid decreases with a rise in temperature. At the critical temperature, the surface tension becomes zero. Answer:

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