12th Chemistry Important Questions Unit 10 Surface Chemistry
TN 12th Chemistry Important Questions Unit 10 Surface Chemistry. 12th Chemistry Important Questions Chapter 10. +2 Chemistry Important 2 Marks, 12th Chemistry Important 3 Marks, Chemistry Important 5 Marks Questions Based on reduced Syllabus 2021-2022. 12th Free Online Test (MCQs). HSC 12th Chemistry Revision Test Important Questions. 12th Tamil Full Guide.
12th Chemistry Important Questions Unit 10 Surface Chemistry
12th Chemistry All Units Important Questions
10. Surface Chemistry
- 1. Give two important characteristics of physisorption
- 2. Differentiate physisorption and chemisorption
- 3. In the case of chemisorption, why does adsorption first increases and then decreases with temperature?
- 4. Which will be adsorbed more readily on the surface of charcoal and why? NH3 or CO2?
- 5. Heat of adsorption is greater for chemisorptions than physisorption. Why?
- 6. In a coagulation experiment, 10 mL of a colloid (X) is mixed with distilled water and 0.1M solution of an electrolyte AB so that the volume is 20 mL. It was found that all solutions containing more than 6.6 mL of AB coagulate within 5 minutes. What are the flocculation values of AB for sol(X)?
- 7. Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.
- 8. What happens when a colloidal sol of Fe(OH)3 and As2O3 are mixed?
- 9. What is the difference between sol and a gel?
- 10. Why are lyophillic colloidal sols are more stable than lyophobilc colloidalsol.
- 11. What are the factors which influence the adsorption of a gas on a solid?
- 12. What do you mean by activity and selectivity of catalyst?
- 13. Why is desorption important for a substance to act as a good catalyst?
- 14. Comment on the statement: Colloid is not a substance but it is a state of the substance.
- 15. Explain any one method for coagulation
- 16. Write a note on electro osmosis
- 17. Write a note on catalytic poison
- 18. Explain intermediate compound formation theory of catalysis with an example
- 19. What is the difference between homogenous and hetrogenous catalysis?
- 20. Describe the adsorption theory of catalysis.
- 21. Define Electrophoresis
- 22. Define the Gold number
- 23. Define promoters with suitable example
- 24. Explain the Characteristics of catalysts
- 25. What is the Tyndall effect?
- 26. What is the Brownian movement?
- 27. ExplainUltra filtration?
- 28. Why colloids are Purify?
- 29. Define Helmholtz doublelayer
- 30. Explain the Electro Dispersion method?
- 31. What is coagulation or precipitation?. What is the various method of coagulation?
- 32. What are the characteristics of adsorption?
- 33. What are active centers?
- 34. What are the general characteristics of catalyst?
- 35. What happens when hydrogen sulphide gas is passed through a solution of arsenic oxide? Name the chemical method.
- 36. What is Flocculation value?
- 37. Write any THREE dispersion methods of preparation of colloids.
- 38. Mention the shapes of the following colloidal particles
a) As2S3 b) Blue gold sol c) tungstic acid sol - 39. Write the dispersion medium and dispersion phase present in butter.
- 40. Write the charge of the following colloids
a) Ferric hydroxide b) Arsenic sulphide c) Clay d) Hemoglobin - 41. Mention the Gold number of the following colloids.
a) Potato starch b) Gum Arabic c) Gelatin d) Egg albumin
