Q.

By a surface of a liquid we mean

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a

a geometrical plane x = 0

b

all molecules exposed to the atmosphere

c

a layer of thickness of the order of 10–9m

d

a layer of thickness of the order of 10–4m

answer is C.

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Detailed Solution

Force of attraction between two molecules of a liquid becomes zero when their separation is of the order of 10-9m, so radius of sphere of influence is of the order of 10-9m. so a molecule lying at the free surface of a liquid can attract other molecules lying within a radius of the order of 10-9m. so option- (3) is right.
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By a surface of a liquid we mean