Question

What is the primary cause of surface tension in a liquid?

• A. The cohesive forces between the molecules of the liquid
• B. The gravitational pull on the liquid molecules
• C. The adhesive forces between the liquid and the container
• D. The chemical reactions occurring at the surface of the liquid

Hint:

Surface tension arises from cohesive forces—strong molecular attractions between like molecules at the liquid’s surface.

Answer 1

The Correct Option is A

Surface tension is the result of cohesive forces among liquid molecules. These forces are particularly strong at the surface of a liquid, where molecules do not have neighboring molecules on all sides.
As a result, the surface molecules experience a net inward force, leading to the minimization of surface area. This phenomenon gives rise to surface tension, which is responsible for effects like the formation of droplets and the ability of some insects to walk on water.
Gravitational pull, adhesive forces, or chemical reactions are not responsible for surface tension.