Question

The potential energy of a molecule on the surface of a liquid compared to one inside the liquid is 

A

zero

B

lesser

C

equal

D

greater

Easy

Solution

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Correct option is
D

greater

When the surface area of  the liquid is increased molecules from the interior of the liquid rise to surface . As these molecules reach the surface work is done against the cohesive force.This work is stored in the molecules in the form of potential energy .Thus , the  potential energy of the molecules lying in the surface is greater than that of the molecules in the interior of the liquid.

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