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 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

water

ethylalcohol

mercury

methyliodide

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