Question

The properties of a surface are different from those of the bulk liquid because the surface molecules:

• A. are smaller than other molecules
• B. acquire charge due to collision from air molecules.
• C. find different types of molecules in their range of influence.
• D. feel a net force in one direction.

Answer 1

Answer: (C), (D)

The correct options are
C find different types of molecules in their range of influence.
D feel a net force in one direction.

The properties of a surface are different from those of the bulk liquid because molecules at surface, are in influence of two types of molecules ( air and liquid ) and feels net downward force of cohesion. But molecules deep inside liquid has zero net force of cohesion and have only liquid molecules in influence.