Question

Smoke is colloidal system of ...... dispersed in .....
1. water ; air
2. air ; carbon
3. carbon ; air
4. none of the above

Fill in the blanks with correct answer.

Answer 1

Colloidal Solution is a heterogeneous mixture in which particle size of substance is intermediate of true solution and suspension i.e. between $1-1000$ nm. Smoke from a fire is example of colloidal system in which tiny particles of solid float in air. Just like true solutions, colloidal particles are small enough and cannot be seen through naked eye. They easily pass through filter paper but colloidal particles are big enough to be blocked by parchment paper or animal membrane.

Hence, smoke is a colloidal system of carbon dispersed in air.