When the temperature is increased,the angle of contact of a liquid:

The angle of contact is $120^{\circ}$ when a cylindrical rod is vertically placed in a liquid. If the same rod is placed horizontally in the liquid, then the angle of contact is (in $^{\circ}$)

The liquid (mercury) meniscus in a capillary tube will be convex if the angle of contact is

Given below are two statements: One is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Clothes containing oil or grease stains cannot be cleaned by water wash.
Reason $(R)$: Because the angle of contact between the oil/grease and water is obtuse.
In the light of the above statements,choose the correct answer from the options given below.

If a liquid does not wet the surface,its angle of contact is acute or obtuse?

The parts of motor cars are polished by chromium because the angle of contact between water and chromium is