Mahatma Gandhi University (MGU) 2012-2nd Sem B.Tech B-tech first&ester mg university chemisrty - Question Paper
First and 2nd semester university ques. paper for regular batches 2012 MG UNIVERSITY.
2 G 1353
PartC
Answer any one full question from each module.
Each full question carries 12 marks.
Module 1
11. () Derive Nernst equation for single electrode potential. (6 marks)
(by Explain the construction and working of Ni-Cd battery. (6 marks)
Or
(lja) Explain the potentiometer method of determination of cell EMF. (6 marks)
(b) Define polarization and decomposition potential. * (6 marks)
Module 2
13y (a) What is tinning ? How it prevents corrosion ? (6 marks)
. (b) Explain the differential aeration corrosion with appropriate example. (6 marks)
Or
14. (a) What is cathodic protection ? Explain sacrificial anode and impressed current methods.
(6 marks)
(b) Explain electroplating and electroless plating used to protect against corrosion. (6 marks)
Module 3
15/ (a) How is silicon rubber obtained ? What are its properties ? (6 marks)
(b) Why polyaniline is considered as. an organic metal ? What are its applications ? (6 marks)
Or
1.6. (a) Discuss the properties and applications of Multi-Walled carbon Nano Tubes. (6 marks) (b) Explain how the structure of a polymer influences the plasticity of the polymer. (6 marks)
Module 4
17. (a) Explain the various steps in sewage treatment. (6 marks)
(b) Why detergents and pesticides need our special attention as water pollutants ? Explain.
(6 marks)
Or
18/ (a) What do you mean by desalination ? How the reverse osmosis and electrodialysis are useful techniques for desalination ?
(9 marks)
(b) Mention the methods to control gaseous pollutants. . (3 marks)
3 G1353
Module 5
Ij). (a) Biofuels will replace conventional fossil fuels in near future. Comment. (5 marks)
(b) What is E-waste ? Explain its disposal. (7 marks)
Or
20. (a) Explain soil erosion and its effects. Describe methods to avoid the same. (6 marks)
(b) Explain the principle of solar cells and how to harness the energy with this source.(6 marks)
[5 x 1.2 = 60 marks]
G 1353 (Pages : 3) Reg- No..U. .aSlM........
Name...?Lb.Q.......................
B.TECH. DEGREE EXAMINATION, MAY 2012 First and Second Semester
EN 010 103ENGINEERING CHEMISTRY AND ENVIRONMENTAL STUDIES
(New Scheme)
[Regular/Improvement/Supplementary]
(Common for all branches)
Time : Three Hours - Maximum : 100 Marks
Part A
Answer all questions briefly.
Each question carries 3 marks.
%
1 What are the merits and demerits of hydrogen electrode ?
2/ Name two corrosion resistant alloys. How do they resist corrosion ?
3y What is meant by compounding of plastics ?
4. What are the sources responsible for pollution ?
5. List three renewable energy sources and their merits.
(5 x 3 = 15 marks)
Part B
Answer all questions.
Each question carries 5 marks.
6 What is emf of a cell ? A cell is constructed by coupling Zn-electrode dipped in 0.5 M Zn S04 and Ni-electrode dipped in 0.05 M NiS04. Write the cell representation, half-cell reaction and net cell reaction. Calculate emf of the cell. Given that standard reduction potentials of Zn and Ni as - 0.76 and - 0.25 V respectively.
2 What is stress corrosion ? Give two examples. How it can be controlled ? t-y*
\x>
8. Explain number average and weight average molecular weights of polymers.
9. Discuss the particulate air pollution, its sources and ill effects.
1p. What is greenhouse effect ? How it leads to global warming ?
(5 x 5 = 25 marks)
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