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The angle of contact at the interface of water-glass is `0^(@)`, Ethylalcohol-glass is `0^(@)`, Mercury-glass is `140^(@)` and Methyliodide-glass is `30^(@)`. A glass caplillary is put in a trough containing one of these four liquids. It is trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the through is
A. Water
B. ethylalcohol
C. mercury methyliodide.

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Correct Answer - C
The meniscus of liquid in a capillary tube will be convex upward if angle of contact is obtuse. It is so when one end of glass capillary tube is immersed in a though of mercury.

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