CBSE Class 12 Chemistry Surface Chemistry Question Bank

Official Class 12 Chemistry Worksheets: Unit 5 Surface Chemistry

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Chapter-wise Practice Material: Unit 5 Surface Chemistry

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QUESTION BANK
Surface Chemistry
 
1. What do you mean by the term –Adsorption? 
 
2. Explain the terms – Adsorbate and Adsorbent? 
 
3. Give two differences between adsorption and absorption? 
 
4. Why do finely divided solids act as good adsorbents? 
 
5. What is adsorption isotherm? 
 
6. Give an equation showing variation of extent of adsorption with concentration of a solution?
 
7. What do you mean by the term promoter? Give an example. 
 
8. What is the optimum temperature and pH for enzyme catalysed reactions? 
 
9. What are colloids? 
 
10. Give two examples of solid Sol and Gel? 
 
11. Colloid is a state not a substance. Explain? 
 
12. What are associated colloids? Give an example? 
 
13. What is CMC and Kraft‟s temperature? 
 
14. Define the term peptization? 
 
15. What is observed when light is passed through a colloidal solution? 
 
16. State Hardy- Schulze rule? 
 
17. What is a protective colloid?
 
18. Alum is used for purification of water. Why? 
 
19. What are the two types of emulsions? 
 
20. Why does a gas mixed with another gas not form a colloidal system? 
 
21. Explain the terms sorption and desorption. 
 
22. “Chemisorption is highly specific.” Illustrate with an example. 
 
23. “Adsorbents in finely divided form are more effective.” Why? 
 
24. „Generally high temperature is favourable for chemisorption.‟ Why? 
 
25. Name the catalyst used in the following process :
(a) Haber‟s process for the manufacture of NH3 gas.
(b) Ostwald process for the manufacture of nitric acid.
 
26. Why gas masks are used by miners in coal mines while working? 
 
27. Write the chemical reaction involved in the preparation of sulphur sol.
 
28. Name the enzyme which converts milk into curd. 
 
29. What are the optimum temperature and pH at which enzymes are highlyactive. 
 
30. What is the composition of colloidion solution? 
 
31. Why do colloidal particles show Brownian movement? 
 
32. Why does sky appear blue to us? 
 
33. What happens when hydrated ferric oxide and arsenioussulphide sols are mixed in almost equal proportions?
 
34. Gelatin is generally added to ice-cream. Why? 
 
35. Mention the two conditions for the formation of micelles. 
 
36. How is Brownian movement responsible for the stability of sols? 
 
37. Which of the following is more effective in coagulating positively charged hydrated ferric oxide sol :
(i) KCl     (ii) CaSO4     (iii) K3 [Fe(CN)6].
 
38. Mention one use of ZSM–5 catalyst. 
 
39. Define the term – desorption? 
 
40. Write the four differences between physisorption and chemisorption? 
 
41. „Adsorption is an exothermic process „. Explain. 
 
42. What is the sign of ΔH, ΔS and ΔG when a gas is adsorbed by an adsorbent? 
 
43. (a) Which gas is adsorbed more readily on charcoal lump: ammonia or carbondioxide and why ?
(b) Which adsorbs more of carbon monoxide:charcoal lump or charcoal powder& why?
 
44. Name the factors which influence the extent of adsorption of a gas on solid. 
 
45. Explain Freundlich adsorption isotherm 
 
46. Define the terms – catalysis and catalyst. 
 
47. What is meant by activity and selectivity of a catalyst? 
 
48. What is shape – selective catalysis? Give an example of shape selective catalyst. 
 
49. Give two examples of enzyme catalysed reaction 
 
50. Explain the mechanism of enzyme catalysis. 
 
51. Differentiate between multimolecular and macromolecular colloid? 
 
52 Write the equation for formation of
(a) Sulphur sol.
(b) Ferric hydroxide sol.
 
53. How is a colloidal solution purified by dialysis?
 
54. Define the terms – (a) Brownian movement (b) Electrophoresis? 
 
55. How does an emulsifying agent work? Give an example of emulsifying agent. 
 
56. Explain the effect of temperature on the extent of physical and chemicaladsorption. 
 
57. Define the term peptization and mention its cause. 
 
58. In what way these are different : (a) a sol and a gel (b) a gel and an emulsion. 
 
59. Define the terms :
(a) Helmholtz electrical double layer.
(b) Zeta potential.
 
60. Mention the two necessary conditions for the observation of Tyndall Effect 
 
61. Account for the following :
(a) Artificial rain can be caused by spraying electrified sand on theclouds.
(b) Electrical precipitation of smoke.
 
62. Write chemical equations for the preparation of sols :
(a) Gold sol by reduction.
(b) Hydrated ferric oxide sol by hydrolysis.

 

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Practice Worksheet and Study Resources for Class 12 Chemistry Unit 5 Surface Chemistry

CBSE Practice Material: Class 12 Chemistry Unit 5 Surface Chemistry

Review targeted practice exercises for Class 12 Chemistry Unit 5 Surface Chemistry. Curated to match official CBSE guidelines, these downloadable PDF sheets support daily revision and core concept reinforcement.

NCERT-Aligned Questions and Solutions

Each worksheet is structured around standard CBSE textbooks, allowing students to check their working steps and correct mistakes early in their revision.

Next Steps in Your Exam Preparation

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