Question

A student was asked to mix egg white with water and stir well. What did he observe?

• A. A solution is formed
• B. Egg white settles down at the bottom
• C. Egg white floats on the surface of the water
• D. A colloid is formed

Answer 1

The correct option is D A colloid is formed

Egg white in water forms a colloidal solution. When we pass a beam of light through a colloidal solution, the path of the light becomes visible when seen from a direction at right angle to that of the incident light. Usually, the particles of size in the range of ${10}^{-6}$ to ${10}^{-9}$ scatter the visible light. This scattering of light by particles in a colloid is known as Tyndall effect.