Ncert Exercises & Solutions

The angle of contact at the interface of the water glass is $0^{\circ},$ ethyl-alcohol glass is $0^{\circ},$ mercury-glass is $140^{\circ}$ and methyl iodide-glass is $30^{\circ}.$ A glass capillary is put in a trough containing one of these four liquids is observed that the meniscus is convex. The liquid in the trough is:
1. water
2. ethyl alcohol
3. mercury
4. methyl iodide

Step 1: Find the angle of contact for which the meniscus is convex.

According to the question, the observed meniscus is of a convex shape which is only possible when the angle of contact is obtuse. Hence, the combination will be mercury-glass(140°).

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