Anna University Chennai B.E Engineering Chemistry B.E/B.Tech DEGREE EXAMINATION 2010 Question paper

B.E/B.TECH DEGREE EXAMINATION,JUNE 2010
SECOND SEMESTER
CY2161-ENGINEERING CHEMISTRY-II
(REGULATION 2008)

PART A( 10X2=20 MARKS )

1. How will you predict the spontaneity of any redox system using emf?

2. Define a reference electrode with an example.

3. Using chemical equations,state the mechanism of corrosion of iron in weakly alkaline solution.

4. Give the principle of electro-deposition.

5. Distinguish between coal and coke.

6. What are the advantages of compressed natural gas?.

7. How many phases and components are present in the following system?
CaC03(s)-->CaO(s)+CO2(g).

8. Give the percentage composition of bronz.

9. Calculate the concentration in ug/ml of a solution of organic compound whose molecular mass is 211.2,in 0.1 M HCL giving an absorbance at its lamtamax 281 nm of 0.62 in a 4cm cell.The major absorptivity at 281 nm is 5372 mole^-1cm^-1.

10. Calculate the number of modes of vibrations for the following molecules : (a)CH4,(b)CO2.

PART B-(5 X 16=80)

11.
i. Differentiate reversible and irreversible cells.Illustrate with examples.
ii. Describe the construction of a saturted calomel electrode.Write its electrode reaction.

Or

12. Give a detailed account of conductometric titrations.

13.
i. When does the electrochemical corrosion occur?Describe the mechanism of electrochemical corrosion.

ii. Write a brief note on cathodic protection methods.

Or

14.
i. What are the constituents and their functions in paints?
ii. Explain the main objectives of electro plating.Give an account of the method used in electroplating of gold.

15.
i. How is proximate analysis of coal carried out?What are its significances?.

ii. What is cracked gasoline?How is it obtained?.

Or

16.
i. How is flue has analysis carried out using Orsat's apparatus?What are its significances?.

ii. What is synthetic petrol?How is it obtained?.

17.
i. State phase rule and explain the terms involved.
ii. Draw and explain the phase diagram of two components system with an example.

Or

18.
i. What are the objectivities of heat treatment?Discuss the different methods of heat treatment of steel.
ii. What are alloys?Write the chemical composition and uses of (1)heat tretable stainless steel and (2)non-heat treatable stainless steel.

19.
i. State Beer-Lambert's law.Mention its applications and limitations.
ii. Explain the instrumentation of IR spectrometer with block diagram .

Or

20.
i. Explain briefly the principle of a flame photo meter.A sample solution is found to contain KCL and NaCl.How will you determine the amount of NaCl alone present in the solution using a flame photometer?
ii. Compare: Flame photometry and Atomic absorbtion spectroscopy.

iii. Write a short note on carbon nano tubes.