Question

Identify the optical property of colloid?

• A. \( \text{Tyndall cone} \)
• B. \( \text{Brownian motion} \)
• C. \( \text{Sedimentation} \)
• D. \( \text{Zeta Potential} \)

Hint:

Think of shining a light through milk or fog – the light beam becomes visible due to the Tyndall effect, an optical phenomenon.

Answer 1

The Correct Option is A

The Tyndall effect is an optical property exhibited by colloids and some very fine suspensions. It is the scattering of light by the particles in a colloid, causing the beam of light to become visible. This scattered light forms a cone-shaped illumination known as the Tyndall cone. Brownian motion is the random movement of particles in a fluid due to their bombardment by surrounding atoms or molecules. Sedimentation is the settling of particles out of a fluid under the action of gravity or centrifugation. Zeta potential is the electrical potential at the slipping plane between a solid surface and the surrounding liquid.