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The angle of contact at the interface of...

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

Text Solution

Verified by Experts

The correct Answer is:
C
According to the question, the observed meniscus is convex which is only possible when angle of contact is obtuse.
Hence, the combination will be of mercury-glass `(140^@)`
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