VTU Engineering Chemistry - June 2014 Exam Question Paper

VTU First Year Engineering (C Cycle) (Semester 2)
Engineering Chemistry
June 2014

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

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
(A) KOH
(B) Nacl
(C) NH₄OH
(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
(C) PVC
(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,
(A) EDTA
(B) E.B.T
(C) NaCI
(D) KOH

1 M

8 (a) (iii) The reagent used in the estimation of sulphate ion in water is,
(A) Phenoldisufonic acid
(B) SPANDS
(C) Alumonia
Barium Chloride

1 M

8 (a) (iv) Temporary hardness of water is due to
(A) Ca(HCO_{3)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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