Applied Chemistry 2 - Dec 2011

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) What is season cracking?(3 marks) 1 (b) Give composition, properties and uses of soft solder.(3 marks) 1 (c) A sample of coal contains C = 70%, O = 23%, H = 5%, S = 1.5%, N = 0.4%, Ash = 0.1%. Calculate G.C.V and N.C.V of fuel.(3 marks) 1 (d) What are fibre composites? (3 marks) 1 (e) What is green fuel?(3 marks) 1 (f) Give significance of proximate analysis. (3 marks) 2 (a) Explain the direct chemical corrosion. (5 marks) 2 (b) 1.5 gm of sample of coal was taken in a crucible for C and H estimation, by combustion method. The increase in weight of tube containing CaCl₂ and bulb containing KOH, was found to be 1.25 gm and 4.88 gm respectively. Calculate %C and %H. (5 marks) 2 (c) Giving conventional and greener route for production of adipic acid, explain related green chemistry principle in this case. (5 marks) 3 (a) Explain method of obtaining biodiesel from vegetable oil? Give advantages of Biodiesel. (5 marks) 3 (b) 100 ml of natural solution containing 0.2 gm of Cu²+ion electrolysed till entire copper was deposited. The currrent strength was 1.2 amperes and volume of solution maintained at 100ml. Assume 100% efficiency. Calculate time taken for deposition of copper. (Atomic wt.of copper = 63.58).(5 marks) 3 (c) Explain the principle of use of safer solvent and reaction condition in green chemistry with suitable examples. (5 marks) 4 (a) Calculate weight of air needed for complete combustion of 1 Kg of coal containing C = 72%, H = 10%, O = 9%, N = 3% and remaining being ash.(5 marks) 4 (b) Describe absorption and catalytic properties of zeolite.(5 marks) 4 (c) What is powder metallurgy? How are metal powders prepared.(5 marks) 5 (a) Give the functions of matrix phase in composite materials and their properties.(5 marks) 5 (b) What is cracking? Give advantages of catalytic cracking over thermal cracking. (5 marks) 5 (c) The composition of gas was found to be H₂ = 10%, CH₄ = 20%, C₂H₆ = 16%, N = 6%, CO = 18%, CO₂ = 22%, O₂ = rest. Calculate volume of air required for complete combustion of 1m³ of fuel. (Mol. Wt. of air = 28.949)(5 marks) 6 (a) Discuss the corrosion due to combination of metals due to metals of different electrode potentials. (5 marks) 6 (b) What are ceramic powder? Explain method of manufacturing any one ceramic powder. (5 marks) 6 (c) Define cetane and octane number (5 marks) 7 (a) How does a catalyst affect the establishment of equilibrium state and activation energy of reaction? Explain with necessary graph.(5 marks) 7 (b) Write characteristics of good fuels. (5 marks) 7 (c) Which are main constituents of varnishes? Write their functions.
OR
Calculate the percent atom economy w.r.t allylchloride
CH₃ — CH = CH₂ + Cl₂ → Cl — CH₂ — CH = CH₂ + HCl(5 marks)