Engineering Chemistry - May 2014

First Year Engineering (Semester 1)

TOTAL MARKS:
TOTAL TIME: HOURS

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)