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The angle of contact at the interface of...

The angle of contact at the interface of water glass is `0^@`, Ethylacohol- glass is `0^@`,mercury glass is `140^@` and Methyliodide - glass is `30^@`. 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

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