State whether the following statements are true or false:

(a) Bread is an example of solid foam.

(b) Sponge is an example of solid sol.

What type of colloids are bread and sponge?

Which of the following contains less solute at a given temperature and pressure?

Unsaturated solution or Saturated solution

State one instance where water undergoes a physical change and one in which it undergoes a chemical change.

Choose one term from the following which includes the other three:

Aerosol, emulsion, colloid, sol

Which of the following is a sol?

Saving cream, Milk, Fog, Soap solution, Hairspray