Question Paper: Engineering Chemistry : Question Paper May 2014 - First Year Engineering (Semester 2) | Pune University (PU)

Engineering Chemistry - May 2014

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.

Solve any one question from Q1 & Q2

1 (a) Describe Ion exchange method for softening of hard water.(6 marks) 1 (b) What is reference electrode? Draw neat labeled diagram of Glass electrodeand give its representation.(3 marks) 1 (c) Explain conductometric titration curve for reaction between weak acidand strong base.(3 marks) 2 (a) Explain different types of electronic transitions occurring in organic molecules on absorption of UV-visible radiations.(6 marks) 2 (b) Define caustic embrittlement. Give causes and prevention of caustic embrittlement in boiler.(3 marks) 2 (c) A water sample is not alkaline to phenolphthalein. However 100 ml of water sample on titration with N/50 HCI required 16.9 ml of acid to get methyl orange end point. Identify the type and determine the extent of alkalinity.(3 marks)

Solve any one question from Q3 & Q4

3 (a) Define addition polymerization. Explain free radical reaction mechanism with suitable example.(6 marks) 3 (b) What is power alcohol? Give its preparation with reactions and any two disadvantages.(3 marks) 3 (c) A coal sample contains C: 80%, H: 10%, S: 2.5%, N:4% and remaining is ash. Calculate the theoretical quantity of oxygen and air required for complete combustion of 1 Kg of given coal sample.(3 marks) 4 (a) What is proximate analysis? Explain the procedure for determination of each constituent with its formula.(6 marks) 4 (b) Distinguish between LDPE and HDPE (any four Points).(3 marks) 4 (c) Give preparation reaction, properties and uses of SBR(3 marks)

Solve any one question from Q5 & Q6

5 (a) Explain manufacturing of hydrogen gas by steam reforming of
i) methane and ii) coke
(5 marks)
5 (b) Explain the structural features of fullerene with diagram and give its applications.(4 marks) 5 (c) Explain the isotopes of carbon with their applications.(4 marks) 6 (a) Explain structural features and applications of diamond and graphite.(5 marks) 6 (b) Explain difficulties in storage and transportation of hydrogen.(4 marks) 6 (c) What are different types of hydrides? Give preparation reaction of germane, silane and lithium hydride(4 marks)

Solve any one question from Q7 & Q8

7 (a) What is Pilling-Bedworth ratio? Give four types of oxide films formed on surface of metal with suitable example.(5 marks) 7 (b) Explain galvanization with neat labeled diagram to protect Iron from corrosion.(4 marks) 7 (c) What is the principle of Cathodic protection? Explain it with any one method.(4 marks) 8 (a) Explain wet corrosion with H2 evolution and O2 absorption mechanism.(5 marks) 8 (b) Distinguish between anodic and cathodic coatings.(4 marks) 8 (c) Discuss factors affecting rate of corrosion, two each, for nature of metal and nature of environment.(4 marks)

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