Question

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

• A. Zero
• B. equal to $45^{\circ}$
• C. equal to $90^{\circ}$
• D. greater than $90^{\circ}$

Answer 1

Answer: (D)

greater than $90^{\circ}$

Answer 2

A liquid does not wet the solid surface if the angle of contact is obtuse ie, greater than $90^{\circ}$. In this case cohesive forces will be greater than adhesive forces and so, the liquid does not wet the surface of solid.