Question

Choose the correct options, and explain the reason for the correct and incorrect options.

Which among the following mixtures show the Tyndall Effect? A mixture of:

1. air and dust particles
2. copper sulfate and water
3. starch and water
4. acetone and water

पर्याय

• a and b

• b and d

• a and c

• c and d

Answer 1

a and c

Explanation:

The Tyndall effect is exhibited by colloids and suspensions because their particles are large enough to scatter light. It is not observed in true solutions since their particles are too small to scatter light.

(a) Air containing dust particles behaves as a suspension or colloidal system; therefore, it shows the Tyndall effect.

(c) A mixture of starch and water forms a colloid; hence, it exhibits the Tyndall effect.

(b) Copper sulfate in water and (d) acetone in water are true solutions. Their particles are too small to scatter light, so they do not show the Tyndall effect.