VTU Engineering Chemistry - June 2012 Exam Question Paper

VTU First Year Engineering (C Cycle) (Semester 2)
Engineering Chemistry
June 2012

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) The standard reduction potential of Mn and Fe are -1.18 V and -044 V respectively. The standard emf of cell formed by combining the above two electrodes will be
(A) +0.74 V
(B) -0.74 V
(C) +1.62 V
(D) -1.62 V

1 M

1 (a) (ii) Primary reference electrode used to measure the electrode potential of other electrodes is
(A) SHE
(B) Calomel electrode
(C) Glass electrode
(D) Silver-silver cloride electrode

1 M

1 (a) (iii) Reference electrode used in potentionmetric determinations is
(A) Glass electrode
(B) Pt-electrode
(C) Calmel electrodic
(D) Ion selective electrode

1 M

1 (a) (iv) If the direction of flow electrons in electrochemical cell is right to left then the cell reaction is
(A) Non spontaneous
(B) Spontaneous
(C) Reversible
(D) Irreversible.

1 M

1 (b) An electrochemical cell consists of metallic zinc immersed in 0.1 M Zn(NO₃)₂ solution and metallic copper immersed in 0.2 M CuSO solution. Calculate emf of the cell at 25°C and change in free energy of the cell reaction E° cell=1.1 V.

5 M

1 (c) Emf of the cell Ag/AgNO₃(C₁) // (C₂=0.2) AgNO₃/Ag I 0.8 V. calculate C₁ of the cell.

3 M

1 (d) what are icon selective electrodes? Discuss the construction of glass electrode and derive an expression relating glass electrode potential and pH.

8 M

Choose your answer for the following :-

2 (a) (i) The electrolyte used in alkaline fuel cell is
2SO₄
(B) KOH
(C) KCL
(D) NH₄Cl

1 M

2 (a) (ii) Hydrogen absorbing negative electrode is used in
(A) Ni-Cd-battery
(B) Ni-MH battery
(C) Li-MnO₂ battery
(D) Zn-MnO₂ battery

1 M

2 (a) (iii) In hydrogen-oxygen fuel cell the electrode used is
(A) KOH
(B) H₂SO₄
(C) LiCl
(D) None of these.

1 M

2 (a) (iv) In which of the following battery the overall cell reaction is note reversible?
(A) Ni-Cd
(B) Ni-MH
(C) Pb-Acid
(D) Zn-MnO₂

1 M

2 (b) What are rechargeable and reserve batteries?

4 M

2 (c) Explain the construction and working of nickel - metal hydride (NiMH) battery.

6 M

2 (d) What are fuel cells? Explain the construction and working of methanol oxygen fuel cell.

6 M

Choose your answer for the following :

3 (a) (i) In galvanic corrosion the less active metal always acts as
(A) Anode
(B) Cathode
(C) Both anode and cathode
(D) None of these

1 M

3 (a) (ii) Caustic embrittlement of boilers is due to presence of excess of
(A) Na₂CO
(B) Ca(OH)₂
(C) CaSO₄
(D) CaCO₃

1 M

3 (a) (iii) In differentiate aeration corrosion the area more accessible to air atcs as
(A) Cathode
(B) Anode
(C) Anode and Cathode
(D) None of these

1 M

3 (a) (iv) Electrolyte used in anodizing of aluminium is
(A) H₂SO₄
(B) KOH
(C) NH₄Cl
(D) HCl

1 M

3 (b) Explain the following types of corrosion
(i) Galvanic corrosion
(ii) Stress corrosion.

6 M

3 (c) What is anodizing? Explain the anodizing of aluminium.

5 M

3 (d) What are corrosion inhibitors? Explain how corrosion is controlled by inhibitors.

5 M

Choose your answer for the following :

4 (a) (i) The process in which the matel ions are deposited on catalytically active surface in presence of reducing agent is
(A) Electroplating
(B) Electroless plating
(C) Immersion platting
(D) Electrophoretic painting

1 M

4 (a) (ii) In electroplating of chromium the anode used is
(A) Achromium
(B) Pb-Sb alloy
(C) Nickel
(D) Copper

1 M

4 (a) (iii) Concentration of metal ions in plating bath is reduced by addition of
(A) Brighteners
(B) Levellers
(C) Complexing agent
(D) All of these

1 M

4 (a) (iv) Reducing agent used in electroless Nickel plating is
(A) Formaldehyde
(B) Sodium Acetate
(C) sodium hypophosphite
(D) Sodium succinate.

1 M

4 (b) What is electroplating? What are the advantages of electroless plating over electroplating?

4 M

4 (c) Explain the process of electroless plating of Nickel on aluminium.

6 M

4 (d) Discuss the chromium plating process.

6 M

Choose your answer for the following :

5 (a) (i) Quality of Gasoline is expressed in terms of its
(A) Octane number
(B) Cetane number
(C) Compression ratio
(D) Compression number

1 M

5 (a) (ii) In fluidized bed catalytic cracking process, the cracking of heavy oil takes place at
(A) 200 - 300°C
(B) 500 - 600°C
(C) 1000 - 1200°C
(D) 1500°C

1 M

5 (a) (iii) Methyl tertiary butyl ether is added to petrol which atcs as
(A) Inhibitor
(B) Accelerator
(C) Ant knocking agent
(D) Catalyst

1 M

5 (a) (iv) Catalysts used in catalytic converter is
(A) Pt, Pd and Rh
(B) Ni, Co and Cr
(C) SiO₂ and Al_{2O₃
(D) Zeolite}

1 M

5 (b) What is knocking? Explain its mechanism.

6 M

5 (c) Explain the construction and working of photovolatic cell.

4 M

5 (d) What us biodiesel? Explain the biodiesel production by transesterification of triqulyceride

6 M

Choose your answer for the following :

6 (a) (i) In potentiometric redox titrations platinum electrode is used in combination with
(A) SHE
(B) Calomel electrode
(C) NHE
(D) None of these

1 M

6 (a) (ii) Condensed phase rule is applied for a system consisting of :
(A) Two component
(B) One component
(C) Multi component
(D) Three component

1 M

6 (a) (iii) Lambert's law states that intensity of monochromatic light decrease exponentially with
(A) Concentration
(B) Path length
(C) Time
(D) Density

1 M

6 (a) (iv) In flame atomic emission spectroscopy the emitted radiation lies in
(A) Visible range
(B) IR range
(C) UV range
(D) None of these

1 M

6 (b) Define the terms phase, component and degree of freedom and explain the appication of phase rule to water system.

8 M

6 (c) What is the principle of flame photometry? What are the process that occur in the flame? Explain the various components of flame photometer.

8 M

Choose your answer for the following :-

7 (a) (i) Addition polymerization is also called
(A) Step polymerization
(B) Chain polymerization
(C) Condensationpolymerization
(D) None of these

1 M

7 (a) (ii) Natural rubber is polymerized form of
(A) Isoprene
(B) Propene
(C) Butene
(D) Styrene

1 M

7 (a) (iii) Free radicals are reactive species having
(A) Paired electrons
(B) Unpaired electrons
(C) Anions
(D) Cations

1 M

7 (a) (iv) Glass transiton temperature of polymer is
(A) First order transition
(B) Second order transition
(C) Thrid order transition
(D) Multiorder transition

1 M

7 (b) Explain the free radical mechanism of addition polymerization taking ethylene as a monomer.

5 M

7 (c) Explain the manufacture of plastics by injection moulding process.

5 M

7 (d) What are polymer composites? Write a note on Kevlar fibre.

6 M

Choose your answer for the following :-

8 (a) (i) Temporary hardness of water is due to
(A) Ca(HCO_{3)₂ and Mg(HCO₃)}2
(B) CaCl₂
(C) CaSO₄
(D) MgSO₄

1 M

8 (a) (ii) Potassium chromate is used as an indicator in analysis of water
(A) Hardness
(B) Alkalinity
(C) Chloride
(D) Fluoride

1 M

8 (a) (iii) Brackish water can be desalinated by
(A) Electrodialysis
(B) Reverse Osmosis
(C) Filtration
(D) Both A and B

1 M

8 (a) (iv) The method adopted to analyze dissolved oxygen in water is
(A) Volhard
(B) Winker
(C) Argentometric
(D) Dumas

1 M

8 (b) What is alkalinity of water? Explain the determination of alkalinity of water.

6 M

8 (c) 20 ml of sample of COD analysis was reacted with 10 ml of 0.25 N K₂Cr₂O₇ and the unreacted dichromate required 6.5 ml of 0.10 N Ferrous ammonium sulphate. 10 ml of same K₂Cr₂O₇ and 20 ml of distilled water the same conditions as the required 26.0 ml of 0.10 NFAS. what is the COD of the sample?

4 M

8 (d) What is desalination? Explain the desalination of water by electrodialysis.

6 M

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