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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
M.Sc.DEGREE EXAMINATION CHEMISTRY
THIRDSEMESTER APRIL 2018
16PCH3MC01- MAIN GROUP ELEMENTS AND NUCLEAR CHEMISTRY
Date: 24-04-2018 Dept. No. Max. 100 Marks
Time: 09:00-12:00
Part-A
Answer ALL questions. (10 × 20)
1. What are crown ethers? Mention any one industrial application of them.
2. How many electrons will be contributed to the framework of cluster compounds by the following
Fe(C5H5) Co(CO)3
3. Give the mechanism of hydroboration reaction.
4. Compute the number of 3c-2e bonds in B6H10.
5. What are polyacids? Give two examples.
6. How is N-trialkyl borazine synthesized from sodium borohydride?
7. What are silicones?
8. Distinguish sub-atomic particles from basic particles.
9. How many α and β particles are emitted in the conversion of 92U238 to 82Pb206.
10. What is meant by orbital electron capture process? Give the equation.
Part-B
Answer any EIGHT questions. × 40)
11. Elucidate the structure of diborane.
12. How are hydrides classified? Mention their unique properties with examples.
13. Derive the possible number and predict the most stable structure for B5H11 . Discuss the types of bonding in the compound..
14. Discuss the structure, types of bonding in C2B10H12 and give any three important reactions.
15. What is inorganic benzene? Why is it called so? Discuss its structure.
16. Discuss the preparation, properties and structure of I2O5.
17. Discuss the structure of the following compounds using VSEPR theory.
XeO2F2 XeO3
18. Give a brief account of mesons and their role in stabilizing the nucleus.
19. Write a brief note on the application of nuclear isotopes in nuclear imaging.
20. What is n/p ratio? Draw a rough n to plot and explain the stability belt. How does a nucleus stabilize itself while it is not falling within the stability belt?
21. Compare the liquid-drop model and shell model of nuclei.
22. Briefly explain the principle of Frocke Dosimeter.
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Part-C
Answer any FOUR questions. × 10= 40)
23a. Discuss the types, structure and bonding of fullerenes.
b. Discuss the reactivity of fullerene on oxidation reduction encapsulation reaction with alkali metals
24a. Write a brief note on PSEPT theory and Predict the structure of
B3H7Fe2(CO)6 B4C2H8 (iii)B4H10
25a. How are silicates classified? Give two examples for each classification.
b. What are zeolite and ZSM-5? Mention their applications.
26. Give a detailed account of nuclear waste management.
27. Discuss the working principle of nuclear reactor and explain how is energy generated from nuclear fuel.
28. Briefly explain any five factors affecting the nuclear stability.