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ANNA UNIVERSITY: CHENNAI 600 025
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? |
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| 2. | Predict whether the following reaction is spontaneous at 25o C. C( s ) + H2O( l ) Ã CO ( g ) + H2 ( g ) DH = 31.4 kcal /mole and DS = 32 cal /deg at 250C. |
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| 3. | What do you mean by steady state principle? Give one example for unimolecular reactions. |
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| 4. | Explain parallel reaction with a suitable example. |
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| 5. | What are reversible and irreversible cells? |
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| 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. |
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| 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? |
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| 8. | What is meant by reverse osmosis? |
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| 9. | What are the functions of fillers and plasticizers in the plastic industry? |
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| 10. | How is PVC prepared? What are its uses?
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| PART - B (5 x 16Marks = 80 Marks)
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| 11.i. | Derive the expression for van’t Hoff’s isotherm for the following general reaction: aA + bB Ã 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
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b) |
Derive the expressions for i. Rate of enzyme catalysed reactions. ii. Rate constant of reactions in terms of thermodynamic functions.
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8 8 |
| 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 |
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| 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.
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| 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 |
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| 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 |
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| 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 |