LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

DB 17

FIFTH SEMESTER – November 2008

CH 5500 – PHYSICAL CHEMISTRY – II

 

 

 

Date : 03-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

 

Answer ALL questions.                                  (10 x 2 = 20 marks)

 

1. What is a reference electrode? Give an example.

 

2. Define EMF.

 

3. What is meant by Hydrogen over voltage?

 

4. Calculate the ionic strength of 0.1M KCl.

 

5. Define order of a reaction.

 

6. What is a Psuedo-unimolecular reaction? Give an example.

 

7. Mention any two factors affecting the enzyme catalysis?

 

8. What is adsorption? Give an example.

 

9. Define quantum yield.

 

10. What is chemiluminesence?

 

PART – B

 

Answer any EIGHT questions.                                   (8 x 5 = 40 marks)

 

11. Explain the experimental method of determining the standard reduction potential

of Zn electrode.

 

12. Explain the working of Weston cell.

 

13. Calculate the EMF of the following electrochemical cell at 25^oC.

 

Cu, Cu²⁺ (a = 0.1 M)  ||  H⁺ (a = 0.01M),  H₂(0.95 atm); Pt E^o_xd cu²⁺| cu 0.34 volt

 

14. Discuss briefly the principle of polarography.

 

15. Explain the term decomposition potential. Discuss its application.

 

16. How is order of a reaction determined experimentally using half life method?

 

17. Explain the kinetics of unimolecular reaction using Luidemann theory.

 

18. Calculate the activation energy of a reaction whose rate constant is tripled by a 10^oC rise in temperature in the vicinity of 27^oC.

 

19. Derive Langmuir adsorption isotherm.

 

20. Discuss the general characteristics of catalytic reaction.

 

21. Derive an expression for rate constant of a second order reaction with equal concentration of

reactants.

 

22. Explain the basic concepts of photosensitized reactions.

 

PART – C

 

Answer ANY FOUR questions.                                 (4 x 10 = 40 marks)

 

23. a) Derive the Nernst equation for a cell reaction.                       (5)

 

1. Derive the emf of a concentration cell with transference. (5)

 

24. a) Explain the determination of pH using quinhydrone electrode.  (5)

 

1. b) How will you prove electrochemically that mercurous ion exists as Hg₂²⁺   (5)

 

25. Explain Debye Huckel Theory of strong electrolytes.

 

26. Explain the collision theory of bimolecular reactions. What are its limitations.

 

27. a) Explain the influence of ionic strength on the rates of ionic reactions.  (5)

 

1. b) Discuss on Absolute reaction rate theory.                                               (5)

 

28. Derive Michaelis – Menton equation for a single substrate enzymatic reaction and explain.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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