Consider the following statements and identify the correct answer.
I) Surface tension of liquids generally decreases with rise in temperature.
II) The angle of contact of mercury with glass is obtuse, while that of water with glass is acute.
III) A drop of liquid under no external forces is always spherical in shape.

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II & III are only true

All are true

I & III are only true

I & II are only true

answer is D.

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Detailed Solution

Cohesive force is stronger in Hg is more than adhesive force between glass and Hg.and it is reverse in the case of water and glass. As cohesive force decreases with temperature surface tension also decreases.

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