Question

2. Monu went to watch a movie with his friends. In the dark, he found a small beam of light
within which million of tiny particles were dancing. He thought, when there were lights, no
such beam appears. He was surprised. Next day, he went to the school and asked about this
from his science teacher. The teacher explained him the reason and Monu was satisfied.
a) What were the tiny particles?
b) What a single term can be used for scattering of light by such particles?
c) Write two points of differences between solution and colloid.
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Answer 1

1. The tiny particles were dust particles.
2. Reflection
3. Solution is a mixture of a solvent and a solute whereas colloid is also a type of solution
4. In colloidal solutions the solute is distributed uniformly through out the solution, but in a solution the solute is dissolved at a molecular level.

Answer 2

Answer:

a. answer is - the tiny particles were particles of dust and smoke.

b. answer is - Tyndall effect.