Q. Why is adsorption always exothermic?

Q. Action of soap is due to emulsification and micelle formation. Comment.

Q. How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?

Q. Explain what is observed when:
(i) a beam of light is passed through a colloidal sol.
(ii) an electrolyte, $NaCl$ is added to hydrated ferric oxide sol.
(iii) electric current is passed through a colloidal sol.

Q. Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

Q. Give four examples of heterogeneous catalysis.

Q. What is an adsorption isotherm? Describe Freundlich adsorption isotherm?

Q. How do emulsifying agents stabilise the emulsion?

Q. What is the difference between multimolecular and macromolecular colloids? Give one example of each. How are associated colloids different from these two types of colloids?

Q. What do you mean by activity and selectivity of catalysts?

Q. What are emulsions? What are their different types? Give examples of each type.

Q. What do you understand by activation of adsorbent? How is it achieved?

Q. Discuss the effect of pressure and temperature on the adsorption of gases on solids.

Q. What are lyophilic and lyophobic sols? Give one example of each type. Why are hydrophobic sols easily coagulated?

Q. What are enzymes ? Write in brief the mechanism of enzyme catalysis

Q. What role does adsorption play in heterogeneous catalysis?

Q. What are the factors which influence the adsorption of a gas on a solid?

Q. How are colloids classified on the basis of:
(i) physical states of components,
(ii) nature of dispersed phase and
(iii) interaction between dispersed phase and dispersion medium

Q. What is the difference between physisorption and chemisorption?

Q. Give reason why a finely divided substance is more effective as an adsorbent.