H4/PG2/15/A16 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001

PCH1015T – REACTION KINETICS, ELECTRODE KINETICS AND PHOTO CHEMISTRY

Time : 3 hrs

Max Marks :75 SECTION – A (15X1=15) Answer ALL Questions

I. Choose the correct answer 1. By collision theory, total number of Collisions fpr a Unimolecular reaction is y2

y2

 k T  b) 2  B   A2 N A2  mA  k T d) 2 B  A2 N A2 mA

 kBT  2 2 a)    ANA  mA 

c) 2  kBT A2 N A2

2. A reaction catalysed by H3O+ only is called _______ catalysis. a) Speciric acid b) Speciric base c) General acid d) General base 3. By Michael’s Menton Consideration the Concentration of _______ rapidly reaches a stationary value. a) E b) S c) ES d) All the above 4. Rates of claim reactions are obtained from ________ reactions. a) Elementary b) Slow c) Fast d) All the above 5. Ionic strength can be Calculated from b) 1  miZi2 c) miZi a)  miZi2 2

d)  miZi

6. Molecular diameter and diffuse layer are considered in _________ model of double layer a) Stern b) Helmholtz c) Debye- Huckel d) All the above

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H4/PG2/15/A16 7. In excimers a complex is formed between a) Ground and ground states b) Ground and excited states c) Excited and excited states d) None of the above 8. In fluorescence the wave length of the emitted light is ________ than that of the absorbed light. a) Lesser b) Greater c) Equal d) All the above 9. In photovoltaic cells the majority carriers are a) Electrons c) Positive holes

b) Protons d) All the above

10. The product formed during the radiolysis of hydrated electron is  a) eaq b) H2 c) H2O2 d) All the above II. Match the following 1 11. Plot of log k Vs is T 12. BET theorem

a)J=Lx b)Secondary  Ea c) 2.303R

13. Onsager law 14. Fluore scence

d) Multilayer

15. Chemical dosimeter

e)Photo physical process

SECTION – B (10X2=20) Answer any TEN Questions 16. How does temperature influence rate of a reaction. 17. What is kinetic isotope effect? 18. Write the mechanism for a specific base catalysed reaction. 19. What is turn over number?

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H4/PG2/15/A16 20. Write the limitations of BET Isotherm. 21. State Debye-Huckel limiting law. 22. Write the Guoy-chapman concept of double layer. 23. What are Onsager phenomenological relations? 24. Differentiate internal conversion and intersystem crossing. 25. Explain Franck-condon principle. 26. What is secondary process in radiation chemistry? 27. Define G-value. SECTION - C (5X8=40) Answer any FIVE Questions 28. Explain the mechanism of acid catalysed reaction. 29. Write a note on types of complex reactions. 30. Write a brief note on electro kinetic phenomena’s. 31. Explain Debye Huckel theory of strong electrolytes. 32. Explain stern-volmer analysis. 33. Write a note on chemical actinometry. 34. Write a note on a) Photo isomerisation process. b) Solar energy conversion

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(4) (4)

Reaction Kinetics , Electrode Kinetics And Photo Chemistry - 04 16 ...

a) Stern b) Helmholtz ... b) H2 c) H2O2 d) All the above. II. Match the following. 11. Plot of 1. log Vs k. T. is a)J=Lx. 12. ... Explain stern-volmer analysis. 33. ... Displaying Reaction Kinetics , Electrode Kinetics And Photo Chemistry - 04 16.pdf.

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