Question

Which of the following is an example of foam? (a) Cheese (b) Dust (c) Froth (d) Fog​

Answer 1

Answer:

(c) Froth is an example of foam.

Answer 2

(c) Froth is an example of foam.

Colloid: These are those compounds which in between the two extremes of true solution and suspension. Their size ranges from 1 nanometre to 1 micrometre.

Some Colloidal Systems:

• Gel: When the dispersed phase is liquid and the dispersion medium is solid. Example - Cheese.
• Aerosol: When the dispersed phase is solid and the dispersion medium is gas. Example - Dust.
• Liquid Aerosol: When the dispersed phase is liquid and the dispersion medium is gas. Example - Fog.
• Foam: When the dispersed phase is gas and the dispersion medium is liquid. Example - Froth.

As colloidal particles are larger than simple molecules, they tend to stay suspended in the solution.