Write three features of chemisorptions which are not found in physisorptions. Illustrate your answer with suitable examples.

3

(a)

(a) How can a colloidal solution and true solution of the same colour be distinguished from each other?
(b) List four applications of adsorption.

3

(a)

(a) Which will be adsorbed more readily on the surface of charcoal and why? NH₃ or CO₂ 
(b) In what way are multimolecular colloids different from macromolecular colloids? Give one example of each,
(c) State the principle of electrodialysis.

 

3

(a)

(a) In which of the following does adsorption take place and why?
(i) Silica gel placed in the atmosphere saturated with water.
(ii) Anhydrous CaCl₂ placed in the atmosphere saturated with water.
(b) How does BF₃ act as a catalyst in industrial process?
(c) Give an example of shape-selective catalysis.

3

(a)

Define the following:
(i) Cationic detergents
(ii) Broad spectrum antibiotics
(iii) Tranquilisers

3

(a)

Give reasons for the following observations:
(i) A delta is formed at the meeting point of sea water and river water.
(ii) NH₃ gas adsorbs more readily than N₂ gas on the surface of charcoal.
(iii) Powdered substances are more effective adsorbents

3

(a)

What are emulsions? What are their different types? Give one example of each type.

3

(a)