Question Paper: Engineering Chemistry : Question Paper Dec 2013 - First Year Engineering (Semester 2) | Pune University (PU)

Engineering Chemistry - Dec 2013

First Year Engineering (Semester 2)

(1) Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8
(2) Assume suitable data, if necessary.

Answer any one question from Q1 & Q2

1 (a) Explain formation of scales in boiler, give their disadvantages and methods of removal.(6 marks) 1 (b) Calculate potential on redox electrode dipped in titration mixture, when 20 ml of 0.1 N Ce4+ solution from the burette is added in 100 ml 0.1 N Fe2+ solution. Standard reduction potentials for Fe3+- ? Fe2+ and Ce4+ - ? Ce3+ are 0.75 and 1.45 V respectively.(3 marks) 1 (c) Explain the conductometric titration of KCI against AgNO3 solution from burette.(3 marks) 2 (a) Explain the principle, instrumentation and applications of UV-Visible spectrophotometer.(6 marks) 2 (b) State the problems in traditional synthesis route and advantages of green route in manufacture of adipic acid.(3 marks) 2 (c) A zeolite softner gets exhausted on softening 4000 litres of hard water. Calculate hardness of the water if the exhausted zeolite requires 10 litres of 10% NaCl solution for regeneration.(3 marks)

Answer any one question from Q3 & Q4

3 (a) (i) Give structural change on vulcanization of natural rubber molecules with sulphur. How does it affect the strength?(3 marks) 3 (a) (ii) State the purpose of compounding polymers with plasticizers and fillers.(3 marks) 3 (b) (i) Give the reaction involved in biodiesel formation and state any three advantages of biodiesel.(3 marks) 3 (b) (ii) Calculate the amount of air (20% excess) required for complete combustion of 1kg wood if it contains 55% carbon, 8% hydrogen, 5% oxygen and remaining non combustible part.(3 marks) 4 (a) (i) Define biodegradation of polymers. State favourable structure of polymer for biodegradation. Write structure of biopol(PHBV).(3 marks) 4 (a) (ii) Give any six differences in thermosoftening and thermosetting polymers.(3 marks) 4 (b) Give construction, working and calculation for finding gross calorific value of a solid fuel by Bomb calorimeter.(6 marks)

Answer any one question from Q5 & Q6

5 (a) Give industrial methods of manufacturing of hydrogen gas.(5 marks) 5 (b) Explain structure of diamond, give its properties and applications.(5 marks) 5 (c) Give preparation, reactions of saline hydrides.(3 marks) 6 (a) State the difficulties in storage of hydrogen gas. Give its chemical storage in alanates and metal hydrides.(5 marks) 6 (b) Give preparation, reactions of silane.(4 marks) 6 (c) Give any one method of preparing carbon nanotubes. State applications of carbon nanotubes.(4 marks)

Answer any one question from Q7 & Q8

7 (a) Give the mechanism of electrochemical corrosion.(5 marks) 7 (b) Explain 'nature of metal' factors affecting rate of corrosion.(5 marks) 7 (c) What are types of metallic coatings? Which is prefered? Why?(3 marks) 8 (a) Give principle, construction and applications of cathodic protection.(5 marks) 8 (b) Explain 'powder coating' method for corrosion control.(4 marks) 8 (c) Account on, 'nature of oxide films on metal surface and its effect on further corrosion.(4 marks)

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