B.E./B.Tech. DEGREE EXAMINATION, May/June
2010.
Common to all B.E./B.Tech. (Except
Marine Engineering)
Second Semester
183202 — ENGINEERING CHEMISTRY — II
(Regulation 2010)
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A — (10 ´ 2 = 20 marks)
1. How do 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 electrode deposition.
5. Distinguish
between coal and coke.
6. What are
the advantages of compresses natural gas.
7. How many
phases and components are present in the following system?
CaCo3
-----> Cao + Co2
8.
Give the percentage composition of bronze.
9.
Calculate the concentration in μ g/ml of
a solution of organic compound whose molecular mass is 211.2 in 0.11 M HCl is
giving an absorbance as its λ max 281nm of 0.612 in a 4cm cell. The major
absorptivity at 281 nm is 5372 mol-1 cm-1
10. Calculate
the number of modes of vibrations for the following molecules. (a) CH4
(b) Co2
Part
– B ( 5 * 16 = 80 Marks)
11. (a)
(i) Differentiate reversible and irreversible cells. Illustrate with examples.
(ii)Describe
the construction of a saturated calomel electrode. Write its electrode
reaction.
Or
(b) Give a detailed account
of conductometric titrations.
12. (a) (i) When does the
electrochemical corrosion occur? Describe its mechanism.
(ii) Write a brief note on cathodic protection
methods.
Or
(b) (i)
What are the constituents and their function in paints?
(ii) Explain the main the
objectives of electroplating. Give an account of the method used in
electroplating of gold.
13. (a) (i) How
is proximate analysis of coal carried out? What are its significances?
(ii)
What is cracked gasoline? How is it obtained?
Or
(b) (i) How is
flue gas analysis is carried out using orsat’s apparatus? What are its
significances?
(ii)
What is synthetic petrol? How is it obtained?
14. (a) (i)
State phase rule and explain the terms involved.
(ii)
Draw and explain the phase diagram of two component system with an example.
Or
(b) (i) What are the objectives of heat treatment? Discuss the
different methods of heat treatment of steel.
(ii)
What are alloys? Write the chemical composition and uses of heat treatable
stainless steel and non-heat treatable stainless steel.
15. (a) (i) State Beer-Lamberts law. Mention its applications and
limitations.
(ii) Explain the instrumentation of IR
spectrometer with block diagram.
Or
(b) (i) Explain briefly the
principle of a flame photometer. 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 absorption spectroscopy.