Question

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
A. water
B. ethylalcohol
C. mercury
D. methyliodide

Answer 1

Correct Answer - C
According to the question, the observed meniscus is of convex figure shape. Which is only possible when angle of contact is obtuse. Hence, the conbination will be of merurgy-glass `(140^@)`.