B.E./B.Tech. DEGREE EXAMINATION, May/June
2009.
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. What are the conditions for an electrochemical cell to
act as standard cell.
2. What is an ion selective electrode?
3. Write the effect of pH of the conducting medium on
corrosion of metals.
4. What is the principle involved in impressed cathodic
current method of prevention of corrosion?
5. What is the drawback of presence of presence of sulphur
in the coal.
6. Define Cetane number.
7. Write the number of phases and components in the
following heterogeneous system.
CuSo4 + 5H2Oà CuSo45H2O
8. Give any two uses each of brass and bronze.
9. What are the sources of IR radiation in IR spectrometer?
10. What are the differences between flame photometry and
atomic absorption spectrometry? Write any two.
Part B – (5*16=80
Marks)
11. (a) (i)What is an irreversible cell? Explain the
irreversibility taking a suitable example.
(ii) Explain the principle
involved in conductometric titrations. Give an experimental procedure for the
titration between a strong acid and a strong base conductometrically.
Or
(b) (i) What is a secondary
reference electrode? Explain the construction and working of a secondary
reference electrode.
(ii) Explain the principle
involved in potentiometric titrations. Write an experimental procedure for
carrying out the titration of a redox reaction.
12. (a) (i) Explain
chemical corrosion. Also explain the intensity of corrosion varying with the
nature of exide lay of formation over metal.
(ii) What is paint? What are the
constituents of paint and their functions?
Or
(b) (i) What is differential
aeration corrosion? Write its mechanism.
(ii) Discuss the various types of
metallic coatings explaining the methods of coating.
13. (a) (i) What is proximate analysis? Write its
significance.
(ii)What is synthetic petrol? How
is it manufactured by Bergin’s process?
Or
(b) What is flue gas analysis? How
is it carried out by Orsat’s process?
14. (a) (i) Explain the lead silver system with the
necessary phase diagram.
(ii) State phase rule. Explain the
terms involved in it with the required examples.
Or
(b) (i) How are the properties of
metals improved by alloy formation?
(ii) What is condensed phase rule?
Explain the thermal analysis of solid solution.
15. (a) How is sodium estimated by flame photometry?
Or
(b) (i) What are the applications
of UV visible spectroscopy?
(ii) Explain the principle and
instrumentation of atomic absorption spectrophotometer.