Hall Ticket No Question Paper Code: AHSB03
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
Four Year B.Tech I Semester End Examinations (Regular) November, 2018
Regulation: IARE R18
ENGINEERING CHEMISTRY
Time: 3 Hours (Common to CSE IT EEE) Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Write a detailed note on electrochemical series.
Describe the construction and working of Lead acid battery with reactions occurring during
charging and discharging
2. Distinguish galvanic corrosion and pitting corrosion. Explain its mechanism. Why we need to
prepare both nut and bolt in same metal?
Explain how cathodic protection is useful in controlling corrosion?
UNIT II
3. Define the term hardness of water? Differentiate between temporary and permanent hardness of
water. Define the various units of hardness and write the relation between them.
Write a detailed note on internal treatment methods of softening of water by Calgon method and
phosphate condition.
4. Explain ion exchange process used to soften water? Why is it considered as the best method to
soften hard water?
Explain the term reverse osmosis? How can be it used to obtain fresh water from sea water?

UNIT III
5. What is doping? Explain in detail how does doping effect on conductance?
Draw the molecular orbital energy level diagram of O2 and NO molecules and calculate its bond
order?
6. Explain in detail about N2 and CO molecules with neat sketches of energy diagrams.
Write the salient features of CFT Explain the transition metal ion d-orbitals splitting in square
planar geometries.
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UNIT IV
7. What is nucleophilic substitution reaction? Write the mechanism of SN1 and SN2 reactions.

Explain Markownikoff and anti Markownikoff's addition rule with suitable example.
8. Explain the structure, synthesis and applications of Paracetamol.
What is Saytzeffs rule? Explain the rule with suitable examples.
UNIT V
9. How the ultimate analysis of coal is carried out and write its significance
Write a short note on
i. Cetane number
ii. Applications of CNG
10. Define octane number. Explain the composition, properties and application of LPG.
The percentage composition of a sample of bituminous coal was found to be as under: C 75.4%;
H O 12.6%; N 1.3% and Ash rest. Calculate the minimum weight of
air necessary for complete combustion of 1 Kg of coal. Oxygen in air is 23% by weight.