Anna University Chennai 2010-2nd Sem B.Tech Electronics and Communications Engineering -ECE ENGGG CHEMISTRY II( - Centre for Distance Education-) - Question Paper

CY2161 Engineering Chemistry II

Time: 3 Hours

Maximum: 100 Marks

ans ALL ques.

Part A - (10 x two = 20 Marks)

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

2. describe a reference electrode with an example.

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

4. provide the principle of electro-deposition.

5. Distinguish ranging from coal and coke.

6. elaborate the advantages of compressed natural gas?

7. How many phases and components are current in the subsequent system?

CaCOCaO+ CO3(s)(s)2(g)

8. provide the percentage composition of bronze.

9. compute the concentration in µg/ml of a solution of organic compound whose molecular mass is 211.2,in 0.11 M HCl giving an absorbance at its max 281 nm of 0.612 in a four cm cell. The major absorptivity at 281 nm is 5372 mole cm.-1-1

10. compute the number of modes of vibrations for the subsequent molecules : (a) CH4

(b) CO2

Part B - (5 x 16 = 80 Marks)

11. (a) (i) Differentiate reversible and irreversible cells. Illustrate with examples. (8)

(ii) define the construction of a saturated calomel electrode. Write its electrode reaction. (8)

OR

11. (b) provide a detailed account of conductometric titrations. (16)

12. (a) (i) When do esthe electrochemical corrosion occur? define the mechanism of electrochemical corrosion.(8)

(ii) Write a brief note on catho dic protection methods. (8)

OR

12. (b) (i) elaborate the constituents and their functions in paints? (6)

(ii) discuss the main objectives of electroplating. provide an account of the method used in electroplating of gold. (10)

13. (a) (i) How is proximate analysis of coal carried out? elaborate its significances?(10)

(ii) What is cracked gasoline? How is it obtained? (6)

OR

13. (b) (i) How is uegas analysis carried out using Orsat's apparatus? elaborate its significances?(10)

(ii) What is synthetic petrol? How is it obtained? (6)

14. (a) (i) State phase rule and discuss the terms involved. (8)

(ii) Draw and discuss the phase diagram of 2 component system with an example. (8)

OR

14. (b) (i) elaborate the objectives of heat treatment? explain the various methods of heat treatment of steel.

(8)

(ii) elaborate alloys? Write the chemical composition and uses of

(1)heat-treatable stainless steel and

(2) non-heat-treatable stainless steel.(8)

15. (a) (i) State Beer-Lambert's legal regulations. Mention its applications a

n

d limitations. (6)

(ii) discuss the instrumentation of IR spectrometer with block diagram. (10)

OR

15. (b) (i) discuss briefly the principle of a ame photometer. A sample solution is obtained to contain KCl and NaCl. How will you determine the amount of NaCl alone current in the solution using a ame photometer? (10)

(ii) Compare : Flame photometry and Atomic absorption spectroscopy. (6)

Earning:   Approval pending.