VTU Question Papers Engineering Chemistry Dec 07 Jan 08

        VTU Question Papers Engineering Chemistry

1st & 2nd Sem B.E. Degree Examination, Dec 07 / Jan 08

 

Note : Answer any FIVE full questions, choosing at least two questions from each part.

Part A

1         a. Describe the Bomb ealorimetric method of determination of calorific value of a solid fuel.

(06 Marks)

  1. What is reforming of petroleum? Give any three reactions involved in reforming. (05 Marks)
  2. What is power alcohol? Give its advantages as a fuel.                                                    (04 Marks)
  3. What is a photo voltaic cell? Explain its working.                                                          (05 Marks)

2          a. What are ion selective electrodes? Explain the measurement of pH of a solution using glass

electrode.                                                                                                                        (07 Marks)

  1. Explain the origin of single electrode potential.                                                             (05 Marks)
  2. Describe the construction and working of a calomel electrode.                                      (04 Marks)
    1. Calculate the emf of the cell Fe/Fe2+(0.01M)|| Ag+(0.1M)/Agat 298 K, if standard electrode potential of Fe and Ag electrodes are – 0.42 V and 0.8 V respectively. (04 Marks)

3          a. Explain the construction and working of lead acid battery along with the reactions involved

during charging and discharging. Mention its applications.                                            (08 Marks)

  1. Explain the construction, working and applications of Nickel — metal hydride battery.

(06 Marks)

  1. Explain the construction and working of the hydrogen – oxygen fuel cell.                     (06 Marks)

4          a. Explain the differential aeration corrosion with a suitable example.                                  (05 Marks)

  1. How does the following factors affect the rate of corrosion:

i) Nature of corrosion product. ii) Temperature. iii) PH.                                              (09 Marks)

  1. Write notes on: i) Galvanizing ii) Tinning                                                                      (06 Marks)

Part B

5          a. What is electroplating? Explain how the following factors influence                               the nature of

electrodeposit: i) Metal ion concentration. ii) Wetting agents.                                          (05 Marks)

  1. Discuss the electro plating of chromium.                                                                           (05 Marks)
  2. Mention the technological importance of metal finishing.                                               (05 Marks)
  3. Explain electroless plating of Nickel and its applications.                                                 (05 Marks)

6          a. Discuss the instrumentation and applications of colorimetric estimation.                          (08 Marks)

  1. What are liquid crystals? Explain the molecular ordering in the following liquid crystal phases: i) Nematic crystal phase ii) Chiral nematic phase iii) Smectic phase. (08 Marks)
  2. Distinguish between thermotropic and lyotrophic liquid crystals with examples. (04 Marks)

7           a. What are polymers? Explain the free radical mechanism of addition polymerization, taking

ethylene as an example.                                                                                                                                       (06 Marks)

  1. What is glass transition temperature? Mention its significance. Discuss any two factors affecting glass transition temperature.                                                                                                    (06 Marks)
  2. Explain the manufacture of the following polymers and mention their uses:
  3. i) Phenol-formaldehyde ii) Polymethyl methacrylate.                                                  (08 Marks)

8          a. Discuss the different types of impurities present in natural water with examples. (04 Marks)

  1. Write a note on reverse osmosis.                                                                                    (05 Marks)
    1. Explain the method of determining sulphate content in water by gravimetric method.

(06 Marks)

3                    „                                    ^ 3

  1. Calculate the COD of the effluent sample, when 25 cm of the effluent requires 8.3 cm of

0.001 M K^C^O? for complete oxidation.                                                                                                 (05 Marks)

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