A) at the free liquid surface gravitational potential energy is more
B) work has to be done to move a molecule to the surface against the repulsive component of the inter molecular forces
C) work has to be done to move a molecule to the surface against the attraction from Other molecules
D) the temperature of the liquid surface is always more than that of the interior of the liquid
Correct Answer: B
Solution :
The molecules on the liquid surface experience net downward force. So to bring a molecule from the interior of liquid to the free surface, some work is required to be done against the intermolecular forces of attraction, which will be stored as potential energy of the molecule on the surface.
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