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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.

answer is B.

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Detailed Solution

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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