The angle of contact at the interface of water-glass is 0^{\circ}, ethylalcohol-glass is 0^{\circ}, mercury-glass is 140^{\circ}, and methyl iodide-glass is 30^{\circ}. A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is

a) water

b) ethylalcohol

c) mercury

d) methyliodide

Answers (1)

The answer is the option (c) Mercury.

In the case of mercury glass, the meniscus of liquid is convex, which makes the angle of contact obtuse. Hence option c is the correct choice.

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