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Q.

The angle of contact at the interface of water-glass is 00, mercury-glass is 1400 and Methyl iodide-glass is 300. 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 

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a

water

b

mercury

c

methyliodide

d

ethylalochol

answer is C.

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Detailed Solution

When a convex meniscus is formed it is clear that the angle of contact is more than 90 degrees, so the liquid must be mercury.

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