Question

a) Which of the following is Lyophobic colloid? 

i) Starch in water 

ii) Gum in water 

iii) Soap in water 

iv) Gold sol 

b) Write four applications of colloids.

Answer 1

a) 

iv) Gold sol 

b) 

• Electrical precipitation of smoke
• Purication of drinking water 
• Medicines 
• Tanning 
• The cleansing action of soaps and detergents 
• Photographic plates and lms 
• Coagulation of rubber latex etc.