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Class 12 Chemistry NCERT Solutions For Chapter 5 Surface Chemistry

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Chapter 5 Surface Chemistry

Download NCERT Solutions for Class 12 Chenistry

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In this pdf file you can see answers of following Questions

NCERT Solutions Exercises Questions


Question 5.1 Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.


Question 5.2 What is the difference between physisorption and chemisorption?


Question 5.3 Give reason why a finely divided substance is more effective as an adsorbent.


Question 5.4 What are the factors which influence the adsorption of a gas on a solid?


Question 5.5 What is an adsorption isotherm? Describe Freundlich adsorption isotherm.


Question 5.6 What do you understand by activation of adsorbent? How is it achieved?


Question 5.7 What role does adsorption play in heterogeneous catalysis?


Question 5.8 Why is adsorption always exothermic ?


Question 5.9 How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?


Question 5.10 Discuss the effect of pressure and temperature on the adsorption of gases on solids.


Question 5.11 What are lyophilic and lyophobic sols? Give one example of each type. Why are hydrophobic sols easily coagulated ?


Question 5.12 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?


Question 5.13 What are enzymes ? Write in brief the mechanism of enzyme catalysis.


Question 5.14 How are colloids classified on the basis of (i) physical states of components (ii) nature of dispersion medium and (iii) interaction between dispersed phase and dispersion medium?


Question 5.15 Explain what is observed
(i) when 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?


Question 5.16 What are emulsions? What are their different types? Give example of each type.


Question 5.17 What is demulsification? Name two demulsifiers.


Question 5.18 Action of soap is due to emulsification and micelle formation. Comment.


Question 5.19 Give four examples of heterogeneous catalysis.


Question 5.20 What do you mean by activity and selectivity of catalysts?


Question 5.21 Describe some features of catalysis by zeolites.


Question 5.22 What is shape selective catalysis?


Question 5.23 Explain the following terms:
(i) Electrophoresis
(ii) Coagulation
(iii) Dialysis
(iv) Tyndall effect.


Question 5.24 Give four uses of emulsions.


Question 5.25 What are micelles? Give an example of a micellers system.


Question 5.26 Explain the terms with suitable examples:
(i) Alcosol
(ii) Aerosol
(iii) Hydrosol.


Question 5.27 Comment on the statement that “colloid is not a substance but a state of substance”

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