Download PTU M-Sc -Chemistry 4th Semester May 2019 71677 ENVIRONMENTAL CHEMISTRY Question Paper

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Total No. of Pages : 02

Total No. of Questions : 09

M.Sc. (Chemistry) (2015 to 2017) (Sem.-4)

ENVIRONMENTAL CHEMISTRY

Subject Code : MSCH-402

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M.Code: 71677

Time: 3 Hrs. Max. Marks : 100

INSTRUCTION TO CANDIDATES :

1. Attempt FIVE questions in all including Question No.1 which is COMPULSORY and selecting ONE each from UNIT-I to IV
2. All Questions carry EQUAL marks.

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1. Answer briefly :
   1. Explain briefly COD.
   2. What is Green Chemistry? Give its some applications in day to day life.
   3. Name two toxic gases that are produced due to burning of plastics.
   4. What do you mean by the term biodegradation? Give examples.
   5. Give examples of some micro and macronutrients present in soil.

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   6. What are biochemical effects of oxides of sulphur?
   7. Name the pollutants of nuclear plant.
   8. What is dissolved oxygen? Give its significance.
   9. What are radionuclides?
   10. Define residual chloride.

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UNIT-I

2. a) Describe in details the various segments of the environment and the chemistry occurring in those segments. b) Discuss biogeochemical cycle of carbon in the environment.

3. a) Discuss biogeochemical cycle of nitrogen in the environment. b) Illustrate the principle of biogeochemical cycling. How do the various natural cycles of the environment sustain life in biosphere?

UNIT-II

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4. a) Discuss the anion redox equilibria in sea water. b) What are living catalysts in living systems? Discuss the mechanism and chemistry of their action.

5. a) Describe in details the Winkler's method and the chemistry involved in it for the determination of dissolved oxygen in water. b) Discuss with examples, some of the microbially-mediated redox reactions in natural water with their significance in environment.

UNIT-III

6. a) Define and describe classical and photochemical smog formation. Discuss the chemistry involved. b) Give an account of inorganic particulate matter. How is it different from organic particulate matter?

7. a) Comment on the origin of a soot particle. How will you monitor toxic inorganics and organics in a soot particle? b) Explain the beneficial and harmful effects of organic wastes to soil. Support your answer with suitable chemical equatio

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UNIT-IV

8. a) Explain the mechanism of action of insecticides and their beneficial and adverse b) What are the environmental impacts of cement and sugar industry? Discuss the methods of the waste management produced by these industries.

9. a) Discuss the aerobic oxidation of sewage. Describe briefly the activated sludge treatment. b) How do you propose solid waste management? Discuss the advantages and limitations of each method proposed.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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