Question

When the temperature increases, the surface tension of water

• A. Increases
• B. Decreases
• C. Remains constant
• D. Shows irregular behaviour

Answer 1

The correct option is B Decreases

So, here we want to know the effect of temperature on surface tension of water.
Let's try to relate it with the attractive forces between the molecules.
Effect of temperature on surface tension: The magnitude of the surface tension of a liquid depends on the attractive forces between the molecules. When the attractive forces are large, the surface tension is large. An increase in temperature increases the kinetic energy of the molecules, and the effectiveness of intermolecular attraction decreases. So the surface tension decreases as the temperature is raised.