What are lyophilic and lyophobic colloids? Give one example of each type. Which one of these two types of sols is easily coagulated and why?

2

(a)

Explain the following terms giving a suitable example for each:
(i) Aerosol
(ii) Emulsion
(iii) Micelle

2

(a)

Define each of the following terms
(i) Micelles
(ii) Peptization
(iii) Desorption.

2

(a)

Explain the following observations:
(a) A lyophilic colloid is more stable than lyophobic colloid.
(b) Coagulation takes place when sodium chloride solution is added to a colloidal solution of ferric hydroxide.
(c) The sky appears blue in color.

2

(a)

Define the following and give an example of each
(a) Coagulation
(b) Tyndall effect.

2

(a)