CBSE Guess > Papers > Important Questions > Class XII > 2007 > Chemistry > Surface Chemistry

Surface Chemistry

NOTE-1 MARK QUESTION FOR SLOW LEARNERS.

1. Define adsorption?
2. What are micelles? Give an example of a micelles system?
3. What is gold number?
4. Explain Brownian motion?
5. Give the expression of Freund lich isothems?
6. What do you understand by desorption ?
7. Define catalysis?
8. What is difference between a sol and a gel?
9. What is an emulsion? Give an example?
10. Define peptization?
11. Give an example of homogenous catalyst & one of heterogenous
    catalyst
12. What are zealites?
13. What is shape of selective catalysis?
14. Give reason why a finely divided substance is more effective as an
    Absorbent.
15. Explain Tyndall effect?
16. What is the principal of dialysis?

NOTE- 2 MARK QUESTIONS.

1. Distinguish between the meaning of the terms adsoreption & absorption. Give one example of each
2. What do you mean by activity & selectivity of catalysts ?
3. What is demulsification ? Name two demulsifiers .
4. Give one example each of “oil in water ’’ & “water in oil ’’ emulsion .
5. Give Hardy-Schulze rule .
6. What is difference between multimolecular & macromolecular colloids? Give an example of each ?
7. What are the factors which influence the adsorption of a gas on a solid ?
8. Differentiate between multi-molecular colloids & micelles with one example of each .
9. What do you mean by an adsorption isotherm?
10. What are difference between hydrophilic & hydrophodic sols ?
11. Differentiate b/n lyophilic & lyophobic sols ?
12. Describe driefly the following -
    (a) dialysis (b)electro-phoresis .
13. Draw a plot of variation in quantity of gas adsorbed .[x/m] with the pressure
    Of the gas . Also plot the graph b/n log x/m is log P at the constant tempreture .
    What is slope of this line ?
    

NOTE-THREE MARKS QUESTION.

1. What is difference between physical adsorption &chemisorption?
2. What are the factor, which influence the adsorption of a gas on a solid?
3. What is an adsorption isotherms? Distinguish between fieund lich adsorption isotherms & langnaur adsorption isotherms.
4. Explain the terms with suitable example-
   (a) Gel (b)Aerosol & (c)hydrosol.
5. What do you understand by adsorption isotherms & adsorption isobars? Explain freundlich adsorption isotherms for the adsorption on solids.

1. Atomic Structure and Chemical Bonding
2. Solid State
3. Solutions
4. Thermodynamics
5. Electrochemistry
6. Chemical Kinetics
7. P Block Elements
8. D and F Block Elements
9. Nuclear Chemistry
10. Stereo Chemistry
11. Organic Functional Group I
12. Organic Functional Group II and III
13. Surface Chemistry
14. Chemistry In Every Day Life
15. Polymers
16. Practice Paper No.1
17. Practice Paper No.2
18. Practice Paper No.3
19. Practice Paper No.4