A liquid will not wet the surface of a solid if the angle of contact is

Options

A. zero
B. equal to `45^(@)`
C. smaller than `90^(@)`
D. greater than `90^(@)`

Answer

D

Explanation

A liquid does not wet the solid surface if the angle of contact is obtuse, i.e., greater than `90^(@)`. In this case, cohesive forces will be greater than adhesive forces.