Download OU B-Tech First Year 2012 January 5005 Chemical Engineering Question Paper

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Time: 3 Hours] [Max. Marks: 75
Note : Answer all questions from Part A. Answer any five
questions from Part B.
PART- A (25 Marks)
1. Define standard electrode potential. What is its significance ? 3

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2. Distinguish between primary and secondary batteries. 2
3. Why the work done in isothermal reversible process is more than the adiabatic
reversible process ? 3
4. Explain the physical significance of entropy. 2
5. Write a note on Galvanic corrosion. 3

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6. What is paint ? What are its constituents ? 2
7. Explain Homo and Co-polymers with an example. 2
8. What are composites ? Give their advantages. 3
9. Define Octane number. What is its significance ? 2
10. Give the characteristics of a good propellant. 3

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PART B (5x10=50 Marks)
11. a) What is Nernst equation ? Derive it for Metal-Metal ion electrode. 4
b) Write the cell reaction and calculate the emf of the following all at 25?C : 4
Zn(s)gn+
2

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(0.2 M) If Ag+ (0.02 M) lAg(s).
Given that E; +0.76 V, and r
Ag
= -0.80V .
Ag

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+

c) What are the advantages of fuel cells ? 2
(This paper contains 2 pages)
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1111 111 11 1 111111111 11 1111111111 11 1 1 Code No.: 5005/N
FACULTY OF ENGINEERING AND INFORMATICS
B.E. 1 Year (New) (Common to All Branches) (Suppl.)
Examination, January 2012
ENGINEERING CHEMISTRY

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Time: 3 Hours] [Max. Marks: 75
Note : Answer all questions from Part A. Answer any five
questions from Part B.
PART- A (25 Marks)
1. Define standard electrode potential. What is its significance ? 3

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2. Distinguish between primary and secondary batteries. 2
3. Why the work done in isothermal reversible process is more than the adiabatic
reversible process ? 3
4. Explain the physical significance of entropy. 2
5. Write a note on Galvanic corrosion. 3

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6. What is paint ? What are its constituents ? 2
7. Explain Homo and Co-polymers with an example. 2
8. What are composites ? Give their advantages. 3
9. Define Octane number. What is its significance ? 2
10. Give the characteristics of a good propellant. 3

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PART B (5x10=50 Marks)
11. a) What is Nernst equation ? Derive it for Metal-Metal ion electrode. 4
b) Write the cell reaction and calculate the emf of the following all at 25?C : 4
Zn(s)gn+
2

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(0.2 M) If Ag+ (0.02 M) lAg(s).
Given that E; +0.76 V, and r
Ag
= -0.80V .
Ag

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+

c) What are the advantages of fuel cells ? 2
(This paper contains 2 pages)
111111111111111111111111111111111

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Code No.: 5005/N
12. a) What are the limitations of first law of thermodynamics ? State the different
statements of second law of thermodynamics.
6
b) One mole of an ideal gas absorbs 400 J of heat from its surroundings and expands

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against a constant external pressure of 1 atm from a volume of 5 litres to 10 litres.
Calculate work done and the change in internal energy for the process. 4
13. a) Define corrosion of metals. Explain the mechanism of electrochemical theory
of wet corrosion.
4

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b) What is cathodic protection ? Explain sacrificial anodic protection method.
3
c)
Calculate the temporary and permanent hardness of sample of water containing :
3

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Ca(HCO
3
)
2
= 32.4 mg/L, Mg(HCO

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3
)
2
= 29.2 mg/L
CaSO

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4
= 27.2 mg/L, MgCl
2
= 9.5 mg/L and NaCI = 40 mg/L.
14. a) Explain addition, condensation and copolymerization with an example.

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6
b) Give the preparation and uses of the following :
4
i) Bakelite ii) Buna-S rubber.
15. a) What are chemical fuels ? Give their classification with examples.

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4
b) What is cracking of petroleum ? Describe with a neat diagram the fixed Bed
Catalytic Cracking method.
6
16. a) Explain the principle and procedure involved in conductometric acid-base

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titrations.
5
b) What is Gibb's phase rule ? Apply it to Pb Ag system by drawing a well
labelled phase diagram.
5

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17. a) Describe the determination of hardness of water by EDTA method.
5
b) Write a short note on the following :
5
i) Conducting polymers

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ii) Ultimate analysis of coal.
2 1,800
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