Question: What is the effect of temperature on the surface tension of a liquid?

Options:

1. Surface tension increases with temperature
2. Surface tension decreases with temperature
3. Surface tension remains constant with temperature
4. Surface tension is independent of the nature of the liquid

Correct Answer: Surface tension decreases with temperature

Solution:

As temperature increases, the kinetic energy of the molecules increases, leading to a decrease in cohesive forces and thus a decrease in surface tension.