Bangalore University 2007-2nd Sem B.E Engineering Chemistry First /BE , - Question Paper

First / 2nd Semester B. E. Degree Examination, July 2007
Common to All Branches
Engineering Chemistry

Time: three Hrs.] [Max. Marks: 100

Note: ans any 5 full questions, choosing at lowest 2 from every part.

PART A

1. a. define Fischer-Tropsch method of synthesis of petrol. (06 Marks)
b. discuss the process of doping of silicon. (05 Marks)
c. What is cracking? discuss fluidized catalytic cracking. (05 Marks)
d. explain the mechanism of knocking. (04 Marks).

2. a. discuss the origin of single electrode potential. Derive Nernst formula for electrode potential. (07 Marks)
b. elaborate reference electrodes? Mention the limitations of primary reference electrode and advantages of secondary reference electrodes. (04 Marks)
c. Write a note on calomel electrode. (04 Marks)

d. Represent the cell formed by the coupling of 2 copper electrodes immersed in cupric sulphate solutions. Concentration of cupric ions in 1 electrode system is 100 times more concentrated than the other. Write the cell reaction and compute the potential at 300K. (05 Marks)

3. a. describe fuel cell. How does it differ from a conventional galvanic cell? (04 Marks)

b. discuss the subsequent fuel cells:
i) Molten carbonate ii) Solid polymer efficiency. (06 Marks)
c. discuss the subsequent battery characteristics:
i) Cycle life ii) Shelf life iii) energy efficiency (06 Marks)
d. define the construction and working of zinc-air battery. (04 Marks)

4. a. describe corrosion. discuss electrochemical theory of corrosion, taking iron as an example. (08 Marks)
b. discuss differential metal corrosion with suitable examples. (06 Marks)
c. What is cathodic protection? discuss corrosion control by sacrifical anode method. (06 Marks)

PART B

5. a. What is electroless plating? Mention its advantages. (04 Marks)
b. explain the subsequent factors influencing the nature of deposit:
i) Throwing power ii) pH of the electrolytic bath and iii) Temperature.
(06 Marks)
c. explain the electroplating of gold and mention its applications. (05 Marks)
d. explain electroless plating of copper and its applications. (05 Marks)
6. a. Distinguish ranging from thermotropic and lytotrpic liquid crystals with examples.
(06 Marks)
b. discuss the working of a liquid crystal in display systems. (06 Marks)
c. elaborate teh advantages of instrumental methods. (03 Marks)
d. discuss the estimation of amount of strong acid in a provided solution conductometrically. (05 Marks)


7. a. describe polymerization. discuss solution and suspension polymerization techniques. (05 Marks)
b. provide the synthesis, properties and uses of i) Teflon ii) Butyl rubber.
(10 Marks)
c. elaborate conducting polymers? provide the structure of polyantiline and mention its applications. (05 Marks)


8. a. explain the kinds of impurities current in natural water. (04 Marks)
b. discuss the determination of hardness of water by Complexometeric method. (06 Marks)
c. discuss the electodialysis method of desalination of water. (04 Marks)
d. explain determination of chloride by Argentometric method. (06 Marks)

Earning:   Approval pending.