Question

When a colloidal solution is observed under ultramicroscope, we can see :

• A. light scattered by colloidal particle
• B. size of the colloidal particle
• C. shape of the colloidal particle
• D. relative size of the colloidal particle

Answer 1

The correct option is A light scattered by colloidal particle

If a homogeneous solution is observed in the direction of light, it appears clear and when it is observed from a direction at right angles to the direction of the light beam, it appears perfectly dark. When a beam of light passes through colloidal solutions, it is scattered, the maximum scattered intensity being in the plane at right angles to the path of light. The path beam becomes visible.