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Oil spreads over the surface of water because

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Surface tension of oil is more than that of cold water.

Surface tension of oil is less than that of cold water.

Surface tension of oil is same as that of cold water.

none of the above statement is right.

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detailed solution

Correct option is B

As surface tension of oil is less than that of cold water, the part of water surface outside the oil-water interface AB shrinks and as a result the drop of oil spreads over the water surface.

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Similar Questions

Consider the following statements.
(A) At critical temperature, surface tension of a liquid becomes zero.
(B) At critical temperature, intermolecular forces for liquids and gases become equal. Also liquid can expand without any restriction

Select the correct option.
(a) (A) is false, But (B) is true.
(b) Both (A) and (B) are true.
(c) (A) is true, But (B) is false.
(d) Both (A) and (B) are false.

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