A liquid is kept in a glass beaker. Which molecules of the liquid have the highest potential energy?

Molecules at the bottom of the beaker

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Molecules near the centre of the liquid

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Molecules lying at half the depth of the liquid and touching the walls of the beaker

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Molecules lying in the surface film

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Solution

The correct option is C Molecules lying in the surface film
If a molecule is brought from within the liquid to surface film, the work has to be done against the downward cohesive and its potential energy increases. Hence the potential energy of the molecule lying within the surface film is greater than the potential energy of the molecule lying below.

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