Explain why
(a) The angle of contact of mercury with glass is obtuse, while that of water with glass is acute. Explain.
(b) Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops.
(c ) Surface tension of liquid is independent of the area of the liquid surface.
(d) Detergents should have small angles of contact.
(e ) A dorp of liquid under no external force is always spherical in shape.
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