Hall Ticket No Question Paper Code: AHSB03
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
Four Year B.Tech I Semester End Examinations (Supplementary) January, 2019
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. What is electrochemical series and explain its application. Can we store CuSO4 in zinc vessel or
silver vessel? Justify your answer .
Derive Nernst equation for reduction electrode potential. Calculate the EMF of the following
Zn-Ag cell at 22:30C if the concentration of ZnSO4 and AgNO3 are 0.091 M and 0.0289 M.
Given that E0
Zn2+/Zn -0.76 v and E0
Ag+/Ag +0.8 v
2. What is wet corrosion? Explain the theory and mechanism of electrochemical corrosion.
What is standard electrode potential? Write the anode and cathode reactions and calculate the
standard EMF of a cell which involves the following cell reaction.
UNIT II
3. How will you determine the total, Temporary and permanent hardness of water using complexometric
method?
Calculate temporary and permanent hardness of a water sample which contains 6.8mg of CaSo4,
33mg of CaCl2, 40mg of Na2SO4, 24mg of MgSO4 per liter of the water sample.(Given Molar
mass of Ca=40g,Na=23g,Mg=24g,S=32g,O=16g,Cl=35g)

4. What is desalination? Describe desalination by reverse osmosis and write its advantages.
A sample of water on analysis was found to contain Mg(HCO3)2 73 ca(HCO3)2 162
CaSO4 136 MgCl2 95 NaOH 40 mg/L. Calculate the permanent,
temporary and total hardness.
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UNIT III
5. Give the reasons for the following
i. O2 is paramagnetic
ii. N2 is diamagnetic
iii. CO is diamagnetic
iv. NO is paramagnetic
Calculate number of bonding and anti bonding orbital's in O2, N2, F2, CO NO molecules?

6. With the help of suitable illustrations explain the crystal field theory of square plannar geometry?

How crystal field splitting takes place in following complexes:
i. Tetrahedral
ii. Square planar
UNIT IV
7. Write short note on stereochemistry of organic compounds.
What is nucleophilic substitution? Explain the mechanism, factors affecting and rate of SN2
mechanism.
8. Explain the structure, synthesis and pharmaceutical applications of Paracetamol.
The concentration of an optically active compound dissolved in chloroform is 6.15/100ml. A
portion of this solution in a 5cm polarimeter tube produced an observed rotation of
Calculate the specific rotation of the compound.
UNIT V
9. What is proximate analysis of coal? How it is carried out and write it s significance.
A sample of coal was found to have the following percentage composition:
O=12.8% and ash=2.1%. Oxygen in air is 23% by weight. Calculate the
minimum amount of air required for complete combustion of 1kg of coal sample.
10. What is calorific value of a fuel? Define gross calorific value and net calorific value of a fuel and
write down the relation between them.
Calculate the gross and net calorific values of a coal sample containing 84% of carbon, 1.5 of
Sulphur, of nitrogen, 5.5% of hydrogen and 8.4% of oxygen. The calorific value of carbon,
hydrogen and Sulphur are 8080 kcal/kg, 34500 kcal/kg and 2240 kcal/kg, respectively, and latent
heat of steam is 587 cal/g.