LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

SIXTH SEMESTER – APRIL 2012

CH 6611/CH 6605 – INDUSTRIAL CHEMISTRY

 

 

 

Date : 23-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

 

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

 

1. Mention the composition of gobar gas.
2. List out the characteristics of anthracite coal.
3. What are mixed fertilizers?
4. What are the advantages of saccharin as a sugar substitute?
5. What is break point chlorination?
6. How is the use of secondary treatment related to COD to BOD ratio?
7. What is acid rain? How is it caused?
8. Assigning reasons, list out the conditions for the dilution of wastewater sample in the

determination of its BOD.

9. How are refractories classified?
10. What are bonded abrasives?

PART – B

 

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

 

11. How is calorific value of a fuel determined?
12. What is meant by knocking in internal combustion engines? How is it related to octane

number?

13. How is DDT manufactured?
14. Explain the process of refining and grading of sugar.
15. How is water softened by lime soda process?
16. Explain the process of reverse osmosis.
17. What are the disadvantages of using hard water?
18. Explain the biochemical effect of carbon monoxide.
19. How does nitric oxide contribute to the stratospheric ozone depletion? Explain using

equations.

20. What is enhanced green house effect? Compare the green house effect potentials of

different green house gases.

 

21. What are the chief constituents of a paint? What are their functions?
22. Describe the manufacture of carborundum and boron carbide.

 

PART – C

 

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

 

23. What is meant by cracking process with respect to petroleum industry? How is catalytic

cracking carried out?

24. Explain with a help of a block diagram, the refining process of crude oil.
25. Describe the process of production of ethanol from molasses by fermentation.
26. How is temporary hardness of water determined by EDTA method?
27. Define COD. How is COD of a sample of wastewater determined?
28. a) What are primary and secondary explosives? Give an example for each. (5)
29. b) How 2,4 D manufactured?                                                                                                         (5)

 

 

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