Applied Chemistry 2 - May 2014

First Year Engineering (Semester 2)

TOTAL MARKS: 60
TOTAL TIME: 2 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Use suitable data wherever required.
(4) Figures to the right indicate full marks.

Answer any five

1(a) Define Octane number of gasoline. How knocking tendency of gasoline 15 related to chemical structures of hydrocarbons is presents?(3 marks) 1(b) What are metallic coatings? Distinguish between anodic and cathodic coating.(3 marks) 1(c) Give composition, properties used of wood's metal.(3 marks) 1(d) Explain 'prevention of waste' principle in Green Chemistry.(3 marks) 1(e) Give classification of composite materials.(3 marks) 1(f) What is "Oxidation corrosion"? Explain why aluminium metal exhibits good corrosion resistance in atmospheric oxygen.(3 marks) 1(g) A coal sample was subjected to ultimate analysis 1.5g of coal on combustion in a Bomb Calorimeter gave 0.24g of BaSO₄.Calculate percentage sulphur in the coal sample.(3 marks) 2(a) How do the following factors affect the rate of corrosion?
Relative areas of anodic and cathodic parts.
Position of metal in galvanic series
pI of medium(6 marks) 2(b) With a suitable diagram,explain process of refining of petroleum.(5 marks) 2(c) Calculate percentage atom economy for the following reaction with respect to acetanilide,
C₅H3NH2+(CH₃CO₂)O → C₆H₃NHCOCH₃+CH₃COOH(4 marks) 3(a) A gaseous fuel has the following composition by volume.H₂ = 55% , CH₄=30%, C₂H₄ = 5%, CO = 5%, N₂=1%, CO₂=2% and O₂=2%. Calculate volume and weight of air required for complete combustion of 1m₃of fuel.(Mol.wt.of air = 28.949)(6 marks) 3(b) Explain conventional and green chemistry route of production of adipic acid.Highlight the green chemistry principle involved.(5 marks) 3(c) What is the principle of cathodic protection method of corrosion control? Explain the method of impressed current cathodic protection.(4 marks) 4(a) What are the drawbacks of plain carbon steel? Explain special effect of the following metals on properties of alloy steel:
Nickel
Chromium
Cobalt
Tungsten(6 marks) 4(b) With a suitable diagram and electrode reaction, explain electrochemical mechanism of rusting of iron in neutral,aqueous medium.(5 marks) 4(c) Discuss the influence of any two chemical factors on adhesive action.(4 marks) 5(a) With a schematic diagram,explain fixed Bed Catalyst Cracking.Mention any two advantages of catalyst cracking over thermal cracking.(6 marks) 5(b) List the various steps involved in powder metallurgy. Mention the aim of each step. Give any two advantages of powder metallurgy.(5 marks) 5(c) Explain 'sandwich panel' type layered composites with a suitable diagram.Mention their application.(4 marks) 6(a) Define 'Paint'. Mention any four constituents of paint and state function of each constituent.(5 marks) 6(b) A sample of coal has the following composition by mass: C =80%,H =4%.O =6%. S=3% ,N =2% and Ash =5%.Calculate Gross and net Calorific value Using Dulong's formula.(5 marks) 6(c) What is an alloy? Explain any four purpose of alloying with suitable examples.(5 marks)