Q2/7P/03-14

Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001 ACH202S – INDUSTRIAL CHEMISTRY

Time: 3 hrs

Max Marks:75 SECTION - A (20X1=20) Answer ALL Questions

I. Choose the correct answer 1. The resulting differences in rates cause the components in a mixture to separate into bands or zones in --------- chromatography a) Paper b) Gas c) Thin layer d) Column 2. A chromatogram is a plot of elution time versus------a) Solvent concentration b) Solute concentration c) Length d) Reaction time 3. Mathematical expression of Beer –lamberts law is a) –dI/ dx= KI b) +dI/ dx= KI c) –dI/ dx= KIC d) +dI/ dx= KIC 4. Alkalinity in water is due to presence of a) OH-,CO32-,HCO3-, b) I-,CO32-,HCO3-, c) Cl ,OH ,Br d) None of the above 5. In acid medium, chromium is estimated by using ________ in colorimetric determination a) Potassium chromate b) S-diphenyl carbazide c) Potassium dichromate d) All the above 6. DDT is synthesized from the following a) Chloral and chlorobenzene b) Benzene and chlorine c) Carbon tetrachloride and chlorobenzene d) Benzene and chloral 7. ------- is an example for a natural polymer is a) Nylon b) Silk c) PVC

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d) Glass

Q2/7P/03-14

8. A copolymer contains a) Similar monomers c) Only linear chain

b) Different monomers d) None of the above

9. Which is not a cation exchanger? a) Sulphonated coals b) Urea – formaldehyde resins c) Sulphonated polystyrene d) Phenol – formaldehyde resins 10. Dimerisation process is a) Exchange of cation c) Exchange of both ion

b) Exchange of anion d)None

II. Fill in the blanks 11. In paper chromatography, Rf value is ________ 12. 1 ppm = -----------13. The insecticide DDT is ________ 14. The monomer of polystyrene is ________ 15. Temporary hardness in water is caused by ------------III. Match the following: 16. Colour

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ε

17. Molar absorptivity

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Fumigant

18. Insecticide

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Chroma

19. Terylene

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Ion exchange

20. Demineralization

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Synthetic polymer

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SECTION - B (10X2=20) Answer any TEN Questions 21. Write about thin layer preparation. 22. What are the factors that affect Rf value? 23. What is attenuate in spectroscopy? 24. What is the basic difference between signal and double beam spectrophotometry? 25. What is Beer’s law? 26. Give any two essential requirements of a fertilizer. 27. How BMC is prepared? 28. Classify plant nutrients. 29. How will you classify polymers? 30. Write a note on step polymers. 31. What is reverse osmosis method? 32. Define disease. SECTION - C (5X7=35) Answer any FIVE Questions 33. Explain column chromatography with a neat diagram.

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34. How will you determine the amount of Cr in K2Cr2O7 by applying Beer-Lamberts law? (7) 35. a) Write the action of ammonium sulphate as fertilizer. b) What are the needs for fertilizers? c) Fungicide - define with example.

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36. a) How will you prepare ammonium sulphate from gypsum? (4) b) Write a note on the action of (NH4)SO4 as a fertilizer. (3) 37. a) Explain weight average molecular weight. b) What is degree of polymerization? c) Write a note on chain polymerization.

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38. a) Write a note on demineralization of water b) Define drug with example. c) Write a note on additives.

(3) (2) (2)

39. Explain zeolite process of water softening.

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