LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

SIXTH SEMESTER – APRIL 2011

CH 6611/CH 6605 – INDUSTRIAL CHEMISTRY

 

 

 

Date : 11-04-2011              Dept. No.                                                    Max. : 100 Marks

Time : 1:00 – 4:00

PART – A

 

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

1. Explain the characteristics of anthracite coal.
2. How is hydrodesulphurisation carried out?
3.  What are plant micronutrients?
4. Give the preparation of Bordeaux mixture.

5. Define break point chlorination.
6. Mention the units in which hardness of water expressed.
7. Where do good ozone and bad ozone occur?
8. What is the role of Cotrell’s precipitator in controlling air pollution?
9. What are acid refractories?
10. Define flash point of a lubricant.

PART – B

 

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

11. Define the term Octane number. How is it related to the structure of the molecules?
12. Describe the method of determination of calorific value of a fuel.
13. How is saccharin synthesised?
14. Describe the manufacture of 2,4 D.
15. Explain the principle and method of determination of temporary hardness of water by EDTA method.
16. How is water softening achieved by ion exchange process?
17. Describe the process of desalination.
18. What is enhanced green house effect? Compare the green house effect potentials of

different green house gases.

19. Explain the biochemical action of cyanide.
20. Discuss the effect of acid rain on plants and sea organisms.
21. What are primary and secondary explosives? Give an example for each.
22. What are abrasives? How is boron carbide prepared?

 

 

PART – C

Answer any FOUR questions                                                       (4 x 10 = 40 marks)

23. What is meant by cracking? How is fluidised bed catalytic cracking carried out?

24.a. How is Gobar gas produced? Explain. (5)

1. How is triple superphosphate prepared? (5)
2. Describe the process of conversion of molasses into ethanol by fermentation.
3. Explain in detail various steps involved in the treatment of wastewater.
4. Define biochemical oxygen demand. How is BOD₅ of a wastewater sample determined?
5. a. Mention the purpose of adding plasticizer and stabilizer to plastics. (5)
6. How is Portland cement manufactured? (5)

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