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Posted By: Fortune Member Level: Diamond Posted Date: 01 Apr 2008
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2007 Anna University B.E CHEMISTRY-I Question paper
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ANNA UNIVERSITY: CHENNAI 600 025
MODEL QUESTION PAPER
B.E./B.Tech. Degree Examinations
First Semester
CM 131 CHEMISTRY-I
Time: 3 Hours Max.Marks: 100
Answer All Questions
PART - A (10 x 2 Marks = 20 Marks)
1. What is work function?
2. Predict whether the following reaction is spontaneous at 25o C. C( s ) + H2O( l ) à CO ( g ) + H2 ( g )DH = 31.4 kcal /mole and DS = 32 cal /deg at 250C.
3. What do you mean by steady state principle? Give one example for unimolecular reactions.
4. Explain parallel reaction with a suitable example.
5. What are reversible and irreversible cells?
6. Calculate the emf of the following cell at 250C Zn( s )/Zn2+(0.1M)//Cu2+(1.75M)/Cu( s ) given that EoZn2+/ Zn = -0.76V and EoCu2+/ Cu = 0.34V.
7. A water sample contains 204 mg of CaSO4 and 73mg of Mg (HCO3)2 per litre. What is the total hardness in terms of CaCO 3 equivalent?
8. What is meant by reverse osmosis?
9. What are the functions of fillers and plasticizers in the plastic industry?
10. How is PVC prepared? What are its uses?
PART - B (5 x 16Marks = 80 Marks)
11.i. Derive the expression for van’t Hoff’s isotherm for the following general reaction: aA + bB à cC + dD. 6
ii. Derive Gibb’s Helmholtz equation and discuss its applications. 6
iii. At 623K, the equilibrium constant of the reaction N2 + 3H2 ==== 3NH3 is found to be 7.08x10-4. At 773K the constant is 1.45 x 10-5. Calculate DH of the equilibrium reaction, assuming that DH remains constant over this temperature range. 4
12.a) i. Derive the expression for the kinetics of opposing reaction assuming first order in both the directions. 6
ii. Discuss in detail the stationary and non-stationary chain reactions. 10
OR
b) Derive the expressions for i. Rate of enzyme catalysed reactions. ii. Rate constant of reactions in terms of thermodynamic functions. 88
13.a) i. Explain the mechanism of hydrogen evolution and oxygen absorption in electrochemical corrosion. Illustrate with suitable diagrams. 10
ii. Explain how sacrificial anode and impressed current methods control corrosion. 6
OR
b)i. Define the term single electrode potential. Derive Nernst equation and give its applications. 8
ii. How is calomel electrode constructed? Discuss how this electrode may be used for the determination of pH of a solution. 8
14.a)i. Explain the various steps involved in the domestic water treatment. 10
ii. How is the exhausted resin regenerated in an ion-exchanger? What are the merits and demerits of ion-exchange method? 6
OR
b)i.. Explain the principle and procedure involved in the determination of permanent and temporary hardness by EDTA method. 12
ii. A zeolite softener was 90% exhausted when 10,000 L of hard water was passed through it. The softner required 200 L of NaCl solution of strength 50g NaCl /L . What is the hardness of water? 4
15.a) i. Describe the method of preparation, properties and applications of bakelite, epoxy resins, PET and polyethylene. 10
ii. Explain the compression and injection molding processes with neat sketches. 6
OR
b) i. Give a detailed account of free radical and condensation polymerization. 10
ii. Define the term functionality of monomers. Explain its significance with suitable examples. 6
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