Question

With an increase in temperature, surface tension of a liquid

• A. increases
• B. remain constant
• C. decreases
• D. first decreases then increases

Answer 1

The correct option is C decreases

We know that surface tension of a liquid is due to cohesive forces acting between molecules.


When temperature of the liquid is increased, the molecules start vibrating more frequently. Hence, cohesive force weakens and surface tension decreases.
Exceptions to this rule are molten copper and cadmium.