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 capillary is put in a through containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the through is

Answer

C

Explanation

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.