engg chemistry dec 2012

7/29/2019 Engg Chemistry Dec 2012

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US N I I I I I I I I I I I 06CHE12/22First/Second Semester B.E. Degree Examination, December 2012

Engineering ChemistryTime: 3 hrs. Max. Marks: 100

Note:J. Answer FIVE full questions choosing at least two from each part.2. Answer all objective type questions only in OMR sheet page 5 o f he Answer Booklet.3. Answers to objective type questions on sheets other than OMR will not be valued.PART-A1 a. Choose the correct answer : (04 Marks)

i) Which of the following is not a primary fuel.A) Wood B) Crude petroleum oil C) Natural gas D) Kerosene

ii) The following is used as antiknock agentA) Triethyllead B) Biethyllead C) Tetraethyllead D) Lead bromide

iii) Photo voltaic cell is used to getA) Light energy B) Heat energy C) Electrical energy D) None of these

iv) Specif ic heat of water isA) 2.5kJ kg- 1 B) 3.0 kJ kg-' C) 8 kJ kg- 1 D) 4.2kJ kg-1/Kb. Define gross and net calorific value of a fuel. (04 Marks)c. What is photo voltaic cell? Explain the working of a photo voltaic cell. (06 Marks)d. Calculate the gross calorific value of a sample of coke from the following data :

Mass of coke = .006 kg Water equivalent of calorimeter = 2.5 kgMass of water = 1.3kg Specific heat of water= 4.187 kJ kg-1 k- 1 ;Rise in temperature= 1.5K. (06 Marks)

2 a. Choose the correct answer : (04 Marks)i) The conductance of an electrolytic solution depends on the conduction of

A) Cation only B) Anion onlyC) Cation and anion D) Colour ofthe solutionii) The primary reference electrode is ,

A) Calomel electrode B) Hydrogen electrodeC) Standar hydrogen electrode D) Zinc electrodeiii) Glass electrode is

A) ion - selective electrode B) H:n selective electrodeC) Membrane electrode D) All oftheseiv) The element which is kept at the top of electro chemical series isA) Ag B) Cu C) Zn D) Li

b. Define standard electrode potential and derive Nernst's equation for electrode potential.(05 Marks)c. What is a reference electrode? Explain construction and working of calomel electrode.d. Write the half- cell reactions and net - cell reaction for the cell.

cd 1 cd2+ (O.OIM) II c"2+ (0.5M) 1c"(s) 1s)(05 Marks)

The standard reduction potentials of cadmium and copper are - 0.40V and + 0.34 V,respectively. Calculate the e.m.f. of the cell. (06 Marks)

3 a. Choose the correct answer : (04 Marks)i) Anode material used in lead -acid battery isA) Mg B) PbOz C) Cu D) Spongy lead

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06CHE12/22ii) The products produced in MeOH-02 fuel cellA) C02 + H20 B) CO + H20 C) C02 + N2 D) None oftheseiii) Which of the following is a classical battery

A) Ni- Cct B) Li- Mn02 C) Zn- air D) Ni-MHiv) Li metal is used in Li - MnOz battery because it isA) Light B) Hard C) Heavy D) Non- Corrosive

b. Explain the following battery characteristics :i) Cycle life ii) Shelf life iii) Energy density.

c. Explain the construction of Pb - acid battery. Give the reactions duringrecharge.

(06 Marks)discharge and(06 Marks)(04 Marks). What are fuel cells? Explain the construction and working ofH2- 02 fuel cell.

4 a. Choose the correct answer : (04 Marks)i) When a metal is corrodedA) Metal is converted into its compound. B) Metal compound is converted into metalC) Brightness ofthe metal increases D) Hardness ofthe metal decreases.ii) Which of the following metal gives sacrificial protection to iron against corrosion

A) Sn B) Ca C) K D) Zniii) Corrosion process involves reaction ofmetal withA) 0 2 B) H20 C) 02 and H20 D) None oftheseiv) lfnuts and bolts are made up ofdifferent match, the corrosion is due toA) differential aeration B) differential metal

C) caustic embittlement D) None oftheseb. Define corrosion of a metal. Explain electrochemical theory of corrosion taking iron as an

example. (06 Marks)c. Explain the effect of the following factors on the rate of corrosion of a metal :i) Temperature ii) Relative areas of anode and cathode iii) pH. (06 Marks)

d. Explain water- line corrosion with an example. (04 Marks)PART-B

a. Choose the correct answer : (04 Marks)i) Use ofHCHO in electroless plating ofCu is to

A) Oxidation Cu B) Reduction of copper ionsC) Conversion ofCu++ into Cu D) Both Band Cii) Use of levelers in electro plating is toA) increase the thickness of coating B) decrease the thickness of coating

C) to make the deposit brighter D) achieve uniform thickness of coating.iii) To coat an irregular article uniformly, the bath used isA) Acid bath B) Alkaline bathC) Neutral bath D) of good throwing power

iv) During electro plating of an article, current density employed isA) High B) Low C) Optimum D) None oftheseb. What is electro less plating? Mention any two advantages of electro less coating. (04 Marks)c. Discuss electro less plating ofCopper. (08 Marks)d. Write a note on decomposition potential. (04 Marks)

6 a. Choose the correct answer : (04 Marks)i) During titration ofHC against NaOH conductance decreases initially because

A) HC is a strong acid B) NaOH is a strong baseC) Highly mobile H+ ions are replaced by less mobile Na+ ionsD) Reaction takes place slowly.

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06CHE12/22

ii) During estimation ofFAS potentiometrically the indicator electrode used isA) Platinum electrode B) Calomel electrodeC) Glass electrode D) Ag/AgCt electrode.

iii) In Colorimetric determination of copper the colouring agent used isA) NH4 CC B) NH4N03 C) (NH4)2 04 D) NH4 OH

iv) Colorimetry involves measurement of absorbance using monochromatic light in theA) Visible range B) I R range C) UV range D) Small rangeb. Distinguish between thermotropic and lyotropic liquid crystals, with examples. (06 Marks)

c. Define specific conductance and explain the estimation of hydrochloric acid in an given solutionconducto metrically using standard solution ofNa OH. (06 Marks)

d. What are instrumental methods of analysis? Indicate the advantages over conventional methods.(04 Marks)7 a. Choose the correct answer : (04 Marks)

i) An example for natural polymer isA) Resin B) Plastic C) Polyester D) Silk

ii) Bakelite isA) Thermoplastic B) Thermosetting plasticC) Homo polymer D) Addition polymeriii) Nylon is made up ofA) Adipic acid B) Hexamethylene diamineC) Both A and B D) Phenol formaldehydeiv) Teflon isA) Hydro carbon polymer B) Fluro carbon polymerC) Hetero polymer D) Thermo setting polymer

b. Explain free radical mechanism of addition polymerization taking ethylene as an example.(06 Marks)c. Explain synthesis and uses of i) Teflon ii) Butyl rubber. (06 Marks)

d. Write a note on thermoplastics and thermosetting plastics. (04 Marks)8 a. Choose the correct answer : (04 Marks)

i) Temporary hardness in water is caused byA) Ca(HC03)2 B) CaC2 C) CaS04 D) MgC2

ii) During the preparation ofFAS solution in COD experiment dilute H2S04 is added to FAS .Crystals toA) make the solution acidic B) speed up the process of dissolutionC) prevent hydrolysis D) Both A & C

iii) During the determination oftotal hardness ofwater by EDTA NH3 - NH4 Ct buffer is usedtoA) Increase PH B) To decrease PHC) To maintain PH at 10 D) None of these

iv) In reverse osmosis, a semi permeable membrane is used to removeA) Suspended impurities B) Colloidal impuritiesC) Bacteria D) Dissolved salts

b. Explain the determination of total hardness of water by EDT A method . (06 Marks)c. In a COD experiment 28.1 mt and 14 .0 m[ of0.05 M FAS solution were required for blank and

sample titration respectively. The volume oftest sample used was 25m. Calculate the COD ofthe sample. (04 Marks)

d. How is sulphate in water determined gravimetrically? (06 Marks)*****

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engg chemistry dec 2012

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