VTU First Year Engineering (C Cycle) (Semester 1)
Engineering Chemistry
May 2014
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Choose your answer for the following :-
1 (a) (i) Calomel electrode is reversible with respect to,
(A) CI- ion
(B) Ag+ ion
(C) \[ Hg_{2}^{2+} \ ion \]
(D) None of these
1 M
1 (a) (ii) A galvanic cell converts:
(A) Electrical energy in to chemical energy
(B) Chemical energy in to electrical energy
(C) Electrical energy in to heat energy
(D) None of these
1 M
1 (a) (iii) The E° value of the cell \[ Zn/Z_{n}^{2+}\left ||Fe^{2+}|Fe \ is \ if \ E^{\circ}_{Fe^{2+}}=-0.44 \ and \ E_{Zn^{2+}}^{\circ}=-0.76 \]
(A) +0.32 V
(B) +1.2 V
(C) -0.32 V
(D) -1.2 V
1 M
1 (a) (iv) Example of an ion selective electrode is
(A) Calomel electrode
(B) Hydrogen electrode
(C) Platinum electrode
(D) Glass electrode
1 M
1 (b) What is single electrode potential? Obtain an expression for the same.
5 M
1 (c) What are reference electrodes? Explain the construction and working of Calomel electrode.
5 M
1 (d) An electrochemical cell is constructed by immersing a silver wire in AgNO3 solution of 0.5 M and a cadmium wire in CdSO4 solution of 0.25 M at 25°C. write the cell diagram, cell reaction and calculate emf of the cell and chage in free energy. Give E° Ag+ = +0.80 and E° cd2+ =-0.40, F=96.5 KJ/kg/V
6 M

Choose the correct answer for the following :-
2 (a) (i) The density of H2SO4 to be maintained in the lead-acid storage cell is
(A) 0.5
(B) 1.2
(C) 2.4
(D) None of these
1 M
2 (a) (ii) In which battery, a key component is separated from rest of the bettery prior to activation.
(A) Primary
(B) Secondary
(C) Reserve
(D) Noen of these
1 M
2 (a) (iii) The reaction taking place at anode of a battery,
(A) Reduction
(B) Addition
(C) Neutralization
(D) Oxidation
1 M
2 (a) (iv) The electrolyte used in H2=O2 fuel cell is
(B) Nacl
(D) Kcl
1 M
2 (b) Explain the following battery characteristics :-
(A) Voltage
(B) Energy storage density
(C) Cycle life
6 M
2 (c) Explain the construction and working of Ni-Cd battery.
6 M
2 (d) Explain the construction and working of H2-O2 fuel cell and mention its applications.
4 M

Choose the correct answer for the following :-
3 (a) (i) Development of non porous and uniform oxide film over a metal surface due to corrosion,
(A) Decreases the corrosion rate
(B) Increases the corrosion rate
(C) Does not have any effect
(D) None of these
1 M
3 (a) (ii) Galvanizing is the process of coating of iron
(A) With Au
(B) With Zn
(C) With Cu
(D) None of these
1 M
3 (a) (iii) Which of the following is an example of cathodic coating,
(A) Galvanizing
(B) tinning
(C) painting
(D) None of these
1 M
3 (a) (iv) Evolution of hydrogen type of corrosion occurs in,
(A) Acedic medium
(B) Basic medium
(C) Both A and B
(D) None of these
1 M
3 (b) What is metalic corrosion? Explain the electro chemical theory of corrosion.
5 M
3 (c) Discuss the effect of the following factors on corrosion rate:
(A) Nature oxide film
(B) Anodic to cathodic area
(C) Polarization
6 M
3 (d) Explain the following corrosion control methods :
(A) Use of inhibitor
(B) Galvanisation
4 M

Choose the correct answer for the following :-
4 (a) (i) Techonological importance of metal finishing is to impart,
(A) Corrosion resistance
(B) Solderability
(C) Thermal resistance
(D) All of these
1 M
4 (a) (ii) Use of complexing agent during electrode deposition is to,
(A) Obtain shining deposite
(B) To check the metal ion concentration
(C) Increase current density
(D) None of these
1 M
4 (a) (iii) The process used to manufacture P.C.B is,
(A) Electroplating
(B) Electrolessplating
(C) Phosphating
(D) Only on plastic surface
1 M
4 (a) (iv) Electroless platting process is possible only on,
(A) Catalytically active surface
(B) Inactive surface
(C) Any surface
(D) Only on plastic surface
1 M
4 (b) What is metal finishing? Mention any 3 technological impotance of metal finishing.
4 M
4 (c) Explain the factor that influence the nature of electrodeposit,
(A) pH of electrolytic bath
(B) Temperature
(C) Current density
6 M
4 (d) What is electroless plating? Explain the process of electroless plating of copper.
6 M

Choose the correct answer for the following :-
5 (a) (i) Methyl tertiary butyl ether is added to gasoline to,
(A) To increase the cetane number
(B) Minimize the knocking
(C) To increase the efficiency of diesel
(D) All of these
1 M
5 (a) (ii) Which of the following posses zero octane number,
(A) Iso Octane
(B) ?-Methyl naphthalene
(C) n-heptane
(D) Cyclohexane
1 M
5 (a) (iii) Photovoltaic cell is a,
(A) Storage cell
(B) Rechargeable cell
(C) Fuel cell
(D) Energy conversion device
1 M
5 (a) (iv) Knocking is due to,
(A) Slow combustion
(B) Incomplete combusion
(C) Instantaneous explosive combustion
(D) All of these
1 M
5 (b) What is calorific value of a fuel? Explain the bomb calorimeter method to determine calorific value of a solid fuel.
6 M
5 (c) Calculate the gross and net calorific value of a coal sample from the following data :
(A) Weight of coal -0.73 g
(B) Weight of water taken in calorimeter 1500 g
(C) Water equivalent of calori meter=470 g
(D) Rise in temperature 2.3°C
(E) Percentage of hydrogen in coal sample 2.5%
(F) Latent heat of stream is 587 calg-1.
5 M
5 (d) Explain the methods of doping of silicon to get solar grade silicon.
5 M

Choose the correct answer for the following :
6 (a) (i) Gibbs phase rule for general system :
(A) P+I=C-2
(B) P+F=C-1
(C) P+F=C+1
(D) P+F=C+2
1 M
6 (a) (ii) Which of the following is a one component system,
(A) Water system
(B) Lead-Silver system
(C) Iron-Carbon system
(D) None of these
1 M
6 (a) (iii) Absorbance of light by a solution of a substance depends on,
(A) Path length
(B) Concentration of solution
(C) Wavelength of incident light
(D) None of these
1 M
6 (a) (iv) Flame photometry is suitable for the detection of,
(A) Li
(B) Cu
(C) Fe
(D) Zn
1 M
6 (b) State phase rule. Discuss the application of phase rule to water system.
5 M
6 (c) Explain the principle and application of potentio metric titration with respect to redox titration.
6 M
6 (d) Discuss the conductometric titration and mention the advantages.
5 M

Choose the correct answer of the following :-
7 (a) (i) Which of the following is a co polymer?
(A) Polythene
(B) Nitrile rubber
(D) Plexi glass
1 M
7 (a) (ii) Requirement for conductivity in polymer is,
(A) Linear structure
(B) Presence of oxidising or reducing agents
(C) Conjugation
(D) All of these
1 M
7 (a) (iii) Natural rubber is polymerized form of
(A) Chloroperene
(B) Isoperene
(C) Propene
(D) None of these
1 M
7 (a) (iv) Benzoyl peroxide is used as,
(A) Initiator
(B) Terminator
(C) Propogator
(D) None of these
1 M
7 (b) What is polymerization? Explain the addition polymerization's mechanism by taking polyethylene as example.
5 M
7 (c) Explain the mechanism of conduction in poly acetylene.
5 M
7 (d) Explain the manufacture of following polymers and mention the uses:
(A) Polymethyl methacrylate
(B) Neoperene
6 M

Choose the correct answer of the following :-
8 (a) (i) Alkalinity in water is not due to,
(A) H+
(B) OH-
\[ (C) \ OH_{3}^{2-} \]
\[ (D) HCO_{-}^{3} \]
1 M
8 (a) (ii) The titrant used in estimation of total hardness of water is,
(B) E.B.T
(C) NaCI
1 M
8 (a) (iii) The reagent used in the estimation of sulphate ion in water is,
(A) Phenoldisufonic acid
(C) Alumonia
Barium Chloride
1 M
8 (a) (iv) Temporary hardness of water is due to
(A) Ca(HCO3)2 and (B) CaCl2
(C) CaSO4
(D) MgSO4
1 M
8 (b) What is desalination? Explain electrodialysis method.
5 M
8 (c) Explain the experimental method of determination of total hardness of water.
6 M
8 (d) 50 ml of sample of water consumed 15 ml of 0.01 MEDTA before boiling and 5 ml of the same EDTA, after boiling. Calculate the total hardness, parameter hardness and temporary hardness.
5 M

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