LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

SUPPLEMENTARY SEMESTER EXAMINATION – JUN 2006

B.Sc. DEGREE EXAMINATION

                                                    CH 5500 – PHYSICAL CHEMISTRY – II

 

 

 

Date & Time : 28/06/2006/9.00 – 12.00        Dept. No.                                                       Max. : 100 Marks

 

 

 

Part–A (20 Marks)

Answer ALL questions (10 x 2 = 20)

1. Write the anodic reaction of the calomel electrode.
2. Calculate the reduction potential of a hydrogen electrode at 25˚C and at pH: 3.
3. What do you mean by primary reference electrode? Give an example.
4. What are concentration cells? Give one example.
5. Explain why a salt like KCl is used in the salt bridge.
6. State any two differences between order and molecularity.
7. What is a parallel reaction? Give an example.
8. Explain how ionic strength affects the rate of a reaction between two cations.
9. Bring out the differences between adsorption and absorption.
10. Define quantum yield.

Part–B (40 Marks)

Answer any eight questions (8 x 5 = 40)

11. Define standard reduction potential. How will you determine its value for the Zn electrode?
12. Derive the equation connecting emf and concentration for a cell.
13. Determine the emf of the cell at 25˚C that could be formed out of the electrodes Zn / Zn ²⁺ (0.1M) (SRP = – 0.78V) and  Cu / Cu ²⁺ (0.04M) (SRP = 0.34 V)
14. Explain ,with a diagram, the working of Weston saturated cadmium cell
15. The standard quinhydrone electrode (SRP=0.6996V) is combined with hydrogen electrode. Calculate the emf of the cell at 25˚C if the pH of the solution at the hydrogen electrode is four.
16. Explain any five types of electrodes with one example for each.
17. A first-order reaction undergoes 60% completion in 45 minutes. Calculate its rate constant and its half life period.
18. Derive the integrated rate equation for a second order reaction involving only one reactant.
19. Explain any two methods of determining the order of a reaction.
20. Obtain the rate equation for an enzyme catalyzed reaction.
21. Derive the ideal adsorption isotherm.
22. Explain the principle of chemiluminescence with an example.

 

Part–C (40 Marks)

Answer any four questions (4 x 10 = 40)

23. Explain the following:

(a) Potentiometric acid-base titration

(b) Determination of pH using hydrogen electrode.

24. (a) Define transport number.

(b) Explain the determination transport number by Hittorff’s method.

25. (a) Define equivalent conductance.

(b) Explain the variation of equivalent conductance with concentration for

a weak electrolyte.

26. (a) Explain the kinetics of an S_N2 reaction.

(b) Discuss collision theory of reaction rate.

27. (a) Explain any five factors that affect the rate of a reaction.

(b) Discuss absolute reaction rate theory.

28. (a)Explain primary and secondary photochemical process with an example for each.

(b) Write a note on photosensitized reactions.

 

 

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