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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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water

ethylalochol

mercury

methyliodide

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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