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The angle of contact at the interface of...

The angle of contact at the interface of water-glass is `0^@`. Ethyl alcohol-glass is `0^@`, Mercury-glass is `140^@` and Methyl iodide-glass is `30^@`. A glass capilalry 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

ethyl alcohol

C

mercury

D

methyl iodide.

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