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

Options

A. water
B. ethyl alcohol
C. mercury
D. methyl iodide

Answer

C

Explanation

Fro convex meniscus, angle of contact greater than `90^(@)` and hence the liquid in the trough is mercury.