LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc., DEGREE EXAMINATION – CHEMISTRY

FIFTH SEMESTER – NOVEMBER 2012

CH 5500 – PHYSICAL CHEMISTRY – II

 

 

 

Date : 03/11/2012             Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART A

Answer All the questions:                                                                                                     10×2=20

 

1. Define EMF.
2. What is calomel electrode?
3. Calculate the ionic strength of 0.1M A1₂(SO₄)
4. What is concentration polarization?
5. Distinguish between order and molecularity.
6. Sketch the energy profile of a reaction and explain energy of activation.
7. Enlist the factors which influence enzyme catalysis.
8. Write the Langmuir adsorption isotherm.
9. Quantum yield of photochemical H₂ –C1₂ reaction is very high. Why?
10. State Einstein’s law of photochemical equivalence.

PART B

 

Answer any EIGHT of the following:                                                                                 8×5=40

 

11. Derive Nernst equation.
12. How will you determine _PH of a solution using glass electrode?
13. Describe the construction and working of Weston cell.
14. Write any one method of determining transference number.
15. Discuss Debye-Huckel theory of activity coefficients.
16. Explain reversible, consecutive with one example.
17. Radioactive strontium-90 has a half life of 28.8 years. How many years will it take for 99% of a given sample of strontium-90 to disintegrate?
18. Discuss the kinetics of unimolecular reactions using Lindemann theory.
19. Derive Michaelis – Menton equation.
20. List out the differences between chemisorptions and physisorption.
21. What are pseudo order reactions? Explain.
22. Deduce Langmuir adsorption isotherm.
23. Explain photosensitized reaction with an example.

PART C

Answer any FOUR of the following:                                                                                  4×10=40

 

24. a) Derive relationships between EMF and (i) ∆G (ii) ∆S.
25. b) How will you find the solubility product of AgCI by EMF measurements?
26. a) Write a note on potentiometric titrations.
27. b) Give the merits and demerits of DME.

 

26. a)Discuss Arrhenius theory of electrolytic dissociation.
27. b) Define equivalent conductance. How will it vary with dilution of

(i) a strong electrolyte.

(ii) a weak electrolyte.

 

27. a) Derive rate equation for a second order reaction of type 2A products.
28. b) Describe graphical method of determining order of a reaction.

 

28. Explain Absolute reaction rate theory.

 

29. a) Apply Langmuir adsorption isotherm to slightly adsorbed systems.
30. b) Discuss the applications of flash photolysis.

 

 

 

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