Q.

The energy of molecules present on the surface of a substance is

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a

Dependent on nature of substance

b

Greater than that of interior molecules

c

Less than that of interior molecules

d

Equal to that of molecules in bulk 

answer is B.

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Detailed Solution

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Molecules at the surface are surrounded by different types of molecules. So, their net intermolecular force of interaction is not zero. As a result, they have more energy than the interior molecules.

Hence, option (B) is correct.

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