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VTU First Year Engineering (C Cycle) (Semester 2)
Engineering Chemistry
June 2013
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

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Choose the correct answers for the following:
1 (a) (i) The driving force for a redox reaction in a galvanic cell is due to
a) ΔG=-nEF
b) ΔG=nEF
c) ΔG=0
d) None of these
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1 (a) (ii) The standard reduction potential of Zn and Fe are -0.76V and -0.44V respectively. The emf of cell formed by combining the above two electrodes will have
a) 0.32V
b) -0.32V
c) -1.2V
d) 1.2V
1 M
1 (a) (iii) When the concentration of chloride ion in silver-silver chloride electrode increases, the reduction potential of the electrode
a) increases
b) decreases
c) does not alter
d) None of these
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1 (a) (iv) Calomel is the commercial name of
a) Mercuric chloride
b) Mercurous chloride
c) Mercuric sulphate
d) Mercurous sulphate
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1 (b) Define single electrode potential. Derive Nernst equation for single electrode potential.
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1 (c) Describe the construction and working of calomel electrode. Write its advantages.
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1 (d) The emf of the cell Cu/CuSO4 (0.01M) 11 CuSO4 (xM)/Cu is 0.0295V at 25°C. Find the value of x.
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Choose the correct answers for the following:
2 (a) (i) Which of the following is a reserve battery
a) Zn-air battery
b) Ni-MH battery
c) Zn-Ag2O battery
d) Li-MnO2 battery
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2 (a) (ii) Which of the following is used in cellular phones
a) Zn-MnO2
b) Zn-air
c) Pb-acid
d) Ni-MH
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2 (a) (iii) The fuel cells are more superior than the conventional batteries because
a) They are light in weight
b) They are not eco friendly
c) They produce direct current at low cost
d) They are easily fabricated
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2 (a) (iv) In Zn-air battery, the cathode of the cell is
a) Graphite
b) Air/C
c) Zn/Air
d) Air/KOH
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2 (b) Describe the construction and working of lead acid battery.
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2 (c) What are fuel cells? Describe the construction and working of CH3OHO2 fuel cell.
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2 (d) Explain the follwing battery characteristics
i) Energy efficiency
ii) Cycle life
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Choose the correct answers for the following:
3 (a) (i) Insoluble corrosion product formed during corrosion process leads
a) To prevent further corrosion
b) Has no effect on corrosion
c) To enhance further corrosion
d) None of these
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3 (a) (ii) At high hydrogen over voltage, the rate of corrosion
a) Increases
b) Decreases
c) Increases initially and then decreases
d) Remains the same
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3 (a) (iii) Which of the following factors accounts for lower corrosion rate
a) Large anodic area and small cathodic area
b) Small anodic area and large cathodic area
c) High temperature
d) High humidity
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3 (a) (iv) Caustic embrittlement is a classic example of
a) Differential aeration corrosion
b) Stress corrosion
c) Differential metal corrosion
d) None of these
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3 (b) What is corrosion? Explain the electrochemical theory of corrosion with respect to iron.
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3 (c) Explain the type of corrosion occuring in the following cases.
i) Presence of small dust particles on iron surface for a long time.ii) Copper nut is contact with iron bolt.
6 M
3 (d) What is anodizing? Explain the anodizing of alluminium.
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Choose the correct answers for the following:
4 (a) (i) The experimentally determined discharge potential of an electrode is 2.57V and its theoritically discharge potential is 1.53V, then the over voltage is
a) 3.345V
b) -1.04V
c) 4.10V
d) 1.04V
1 M
4 (a) (ii) Electroless plating is possible only on
a) Catalytically active surface
b) Inactive surface
c) Any surface
d) None of these
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4 (a) (iii) Which of the following is essential in electroless plating?
a) Oxidizing agent
b) Reducing agent
c) Anode
d) Electrical energy
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4 (a) (iv) Driving force in electroless plating is
a) Power supply
b) Oxidizing agent
c) Auto catalytic redox reaction
d) None of these
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4 (b) Explain the following factors influencing the rate of electro deposit.
i) Current density
ii) Wetting agent
iii) pH
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4 (c) Describe the process of electroless plating of copper.
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4 (d) Explain the terms
i) Decomposition potential
ii) Over voltage
6 M

Choose the correct answers for the following:
5 (a) (i) Zone refining technique for purification of solar grade silicon is based on
a) Henry's law
b) Newton's law
c) Partition law
d) Phase rule
1 M
5 (a) (ii) Which of the following is not a secondary fuel?
a) Coal gas
b) Water gas
c) Producer gas
d) Natural gas
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5 (a) (iii) Methyl tertiary butyl ether is added to gasoline to
a) Increase the octane number
b) Minimize knocking
c) Increase the efficiency of the IC engine
d) All of the above
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5 (a) (iv) Catalysts used in catalytic converters are
a) Pt, Pd and Rh
b) Ni, Co and Cr
c) Al2O3 and SiO2
d) Zeolite
1 M
5 (b) What is knocking in IC engines? Explain its mechanism with chemical reaction. Mention its ill effects.
6 M
5 (c) What is meant by cracking? Describe the fluidized bed catalytic cracking process.
6 M
5 (d) Calculate the calorific value of a sample of coal from the following data:
Mass of coal=0.95g
Mass of water in copper calorimeter=2000g
Water equivalent of calorimeter=700g
Rise in temperature=2.8°C
Sp. heat of water=4.187kJ/kg/°C
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Choose the correct answers for the following:
6 (a) (i) In a flame photometer, the light emitted is in,
a) IR region
b) UV Region
c) Visible Region
d) None of these
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6 (a) (ii) In estimation of FAS by potentiometry the indicator electrode used is
a)Silver-Silver chloride electrode
b) Platinum electrode
c) Calomel electrode
d) Glass electrode
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6 (a) (iii) Lamberts law states that intensity of monochromatic light decreases expontially with
a) Concentration
b) Path length
c) Time
d) Density
1 M
6 (a) (iv) Gibb's phase rule is applicable to
a) Heterogenous systems
b) Heterogenous systems in equilibrium
c) Homogenous systems
d) All of these
1 M
6 (b) State the Phase rule and explain the terms involved with examples.
6 M
6 (c) Draw the phase diagram for water system and explain the salient features.
6 M
6 (d) Write brief note on conductometric titrations.
4 M

Choose the correct answers for the following:
7 (a) (i) Natural rubber is the polymerized form of
a) Chloroprene
b) Isoprene
c) Propene
d) Styrene
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7 (a) (ii) A polymer of high optical clarity used in preparation of lenses is
a) Teflon
b) Phenol formaldehyde
c) Neoprene
d) PMMA
1 M
7 (a) (iii) Which one among is a conducting polymer
a) Aniline
b) Pyrrole
c) Polyacetylene
d) Acetylene
1 M
7 (a) (iv) Very high molecular weight polymers will have,
a) Low Tg
b) High Tg
c) Moderate Tg
d) No Tg
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7 (b) What are polymers? Discuss the free radical mechanism of polymerization of ethylene.
6 M
7 (c) Give the synthesis and an application of
i)Butyl rubber
ii) PMMA
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7 (d) Describe the synthesis and applications of Kevlar fibre.
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Choose the correct answers for the following:
8 (a) (i) Secondary treatment of sewage is carried out to reduce
a) Organic load
b) Inorganic load
c) Destroy microorganisms
d) None of these
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8 (a) (ii) The complexing agent spectrometric analysis of nitrates is
a) SPADNS
b) Ammonia
c) Phenol sulphonic acid
d) Phenol disulphonic acid
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8 (a) (iii) The method used for desalination of water is
a) Zeolite process
b) Lime-soda process
c) Ion-exchange process
d) Reverse osmosis process
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8 (a) (iv) The indicator used for estimation of total hardness of given water sample by EDTA method
a) Starch
b) Eriochrome black-T
c) Ferroin
d) Methyle orange
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8 (b) What is desalination? Explain the desalination of water by electrodialysis.
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8 (c) Explain the argentometric method of determination of chloride in water. Write the reactions involved.
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8 (d) Explain the terms:
i) BOD
ii) COD
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