Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Surface tension is the result of cohesive forces between molecules in the bulk of a liquid.
Reason (R) : Surface tension is a measure of the energy required to increase the surface area of a liquid due to the attractive forces between molecules at the surface.
In light of the above statements, choose the correct answer from the options given below.

• A. Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
• B. Both (A) and (R) are true and (R) is the correct explanation of (A).
• C. (A) is true but (R) is false.
• D. (A) is false but (R) is true.

Hint:

To understand surface tension molecular forces:
- In the bulk: Balanced cohesive forces \(\rightarrow\) Net force is zero.
- At the surface: Unbalanced cohesive forces \(\rightarrow\) Net force is inward.
This net inward pull is the direct cause of surface tension.

Answer 1

The Correct Option is D