The value of the contact angle for kerosene with a solid surface is ........ $^o$.

$A$ liquid does not wet the solid surface if the angle of contact is

If a water drop is kept between two glass plates,then its shape is

The angle of contact between glass and mercury is......... $^o$

What is the shape of the meniscus when a non-wetting liquid is placed in a capillary tube?

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.