VTU Question Papers Engineering Chemistry June July 08

VTU Question Papers Engineering Chemistry

1st & 2nd Sem B.E. Degree Examination, June/July 08


Note : Answer any FIVEfull questions, choosing at least two questions from each part

Fart – A

1            a. Describe the experimental determination of calorific value of a solid fuel using Bomb

calorimeter.                                         (06 Marks)

  1. What is synthetic petrol? Describe the Bergius method of synthesis of petrol. (05 Marks)
  2. Write a note on reforming of petrol.                 (04 Marks)
  3. Explain construction and working of silicon photovoltaic cell.   (05 Marks)

2            a. What are reference electrodes? Explain the construction and working of calomel electrode.

(05 Marks)

  1. Calculate the standard electrode potential of Cu2+] Cu if its electrode potential at 25° C is 0.296V when [Cu2+] is 0.015 M.                                                    (03 Marks)
  2. What are ion-selective electrodes? Explain the measurement of pH of a solution using glass electrode.                   (07 Marks)
  3. Derive Neams’t equation on electrode potential.      (05 Marks)

3             a. Explain the following battery characteristics:

i) Energy efficiency ii) Current capacity iii) Cycle life.  (06 Marks)

  1. Describe the construction and working of Lead — acid battery.    (08 Marks)
  2. Describe the construction and working of H2 -O2 fuel cell.   (06 Marks)

4            a. Discuss the effect of following on the rate of corrosion.

i) Nature of the metal; ii) Nature of the corrosion product; iii) pH ; iv) area effect.

(08 Marks)

  1. Explain differential aeration corrosion with suitable example.   (06 Marks)
    1. What is cathodic protection? How a metal is cathodically protected by sacrificial anode method.                        (06 Marks)

Part – B

5            a. Define polarization, decomposition potential and over voltage. Mention their significance

with reference to electrode position.                (08 Marks)

  1. How do the following affect the nature of electroplating?

i) Current density ii) temperature iii) pH iv) Organic additives.  (08 Marks)

  1. What is electroless plating? Mention any two advantages.    (04 Marks)

6             a. What are liquid crystals? Distinguish between thermotropic and lyotropic liquid crystals

with examples.                                       (06 Marks)

  1. Explain the working of liquid crystals in display systems.  (06 Marks)
    1. What are the advantages of conductometric titrations over conventional titrations?

(03 Marks)

  1. Explain the determination of concentration of an unknown solution by colorimetric method.                                (05 Marks)

7            a. Define polymerization. Explain different types of polymerization processes with suitable

examples.                                                                                                                    (05 Marks)

  1. Give synthesis and uses of the following polymers i) Teflon ii) Neoprene                                               (06 Marks)
  2. Write a note on compounding of resins.               (04 Marks)
  3. Write preparation, properties and uses of epoxy resins.     (05 Marks)

8             a. Explain temporary and permanant hardness of water.  (04 Marks)

  1. Define B.O.D and C.O.D and mention various steps involved in sewage treatment.

(04 Marks)

  1. Describe the argentometric method of estimation of chloride content of a water sample.

(04 Marks)

  1. What is potable water? Describe the electrodialysis process of desalination of water.

(08 Marks)

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