Applied Chemistry 2 - Dec 2013

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 of the following:

1 (a) Define octane number of gasoline. Name any two anti-knock agents.(3 marks) 1 (b) Why is galvanization of iron articles preferred to tinning?(3 marks) 1 (c) Give composition properties and uses of Wood's metal.(3 marks) 1 (d) Explain prevention of waste principle in green chemistry.(3 marks) 1 (e) Define matrix phase of composite material. Give functions of matrix phase. (3 marks) 1 (f) State the Characteristics of good paint. (3 marks) 1 (g) A coal sample was subjected to ultimate analysis. 1.5g of coal on combustion in a bomb calorimeter gave 0.42g of BaSO₄. Calculate percentage sulphur in the coal sample.(3 marks) 2 (a) How do the following factors affect the rate of corrosion?
i. Relative areas of cathodic and anodic parts
ii. Passive character of metal
iii. pH of medium(6 marks) 2 (b) What is biodiesel? Give trans-esterification reaction in preparation of biodiesel from vegetable oils. What are the advantages of biodiesel? (5 marks) 2 (c) Calculate the percentage atom economy for the following reaction with respect to acetophenone:-
(4 marks) 3 (a) A gaseous fuel has following composition by volume: H₂ = 50%, CO = 30%, CH₄ = 30%, C₂H₄ = 5%, N₂ = 1%, O₂ = 2% and CO₂ = 2%. Calculate volume and weight of air required for complete combustion of 1m³ of 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) Discuss differential aeration corrosion with the help of a suitable example.(4 marks) 4 (a) What are alloy steels? Explain special effects of the following metals on properties of alloy steels:-
i. Chromium
ii. Nickel
iii. Cobalt
iv. Tungsten(6 marks) 4 (b) What is the principle of cathodic protection method of corrosion control? Explain any one method of corrosion control by cathodic protection. (5 marks) 4 (c) Write a short note on sandwich panel type layer composites.(4 marks) 5 (a) What is catalytic cracking? With a schematic diagram, explain any one method of catalytic cracking. (6 marks) 5 (b) What is powder metallurgy? How are metal powders prepared?(5 marks) 5 (c) Discuss the influence of any two physical factors on adhesive action. (4 marks) 6 (a) What is oxidation corrosion? Discuss the role of nature of oxide formed in oxidation corrosion. (5 marks) 6 (b) A sample of coal has the following composition by weight:- C = 82%, H = 6%, O = 8%, S = 0.5%, N = 3% and Ash = 0.5%. Calculate Gross and net calorific value using Dulong s formula.(5 marks) 6 (c) What is an alloy? Explain any four purposes of alloying with suitable examples. (5 marks)