Model Question Paper-1 with effect from 2018-19
(CBCS Scheme)
USN
18CHE12/22
First/Second Semester B.E.Degree Examination
Engineering Chemistry
(Common to all Branches)
Time 3 Hrs Max.Marks:100
Note: Answer any FIVE full questions, choosing one full question from each module
Module-1
1. a. Define the terms: Free energy, Entropy Cell potential Marks)
b. What are concentration cells? The cell potential of Cu concentration cell
Cu/CuSO4 (0.005M) CuSO4 Cu is 0.0295 V at 25° C.
Write the cell reaction and calculate the value of X. Marks)
c. What are batteries? Explain the construction and working of Li-ion battery,
mention its applications. Marks)
OR
2. a. Write short notes on primary, secondary and reserve batteries. Marks)
b. Explain the construction and working of Ni-MH battery. Mention its applications.
Marks)
c. For the cell, Fe/Fe2+ (0.1M)/Ag write the cell reaction and calculate the
emf of the cell at 298K, if standard electrode potentials of Fe and Ag electrodes are
-0.44V and 0.8 V respectively. Marks)
Module-2
3. a. What is metallic corrosion? Describe the electrochemical theory of corrosion
taking iron as an example. Marks)
b. Explain: Differential metal corrosion Water-line corrosion Marks)
c. What is electroplating? Explain the electroplating of chromium Marks)
OR
4. a. What is meant by metal finishing? Mention (any five) technological importance
of metal finishing. Marks)
b. What is electrolessplating? Explain the electrolessplating of copper. Marks)
c. Explain the factors affecting the rate of corrosion Nature of corrosion product,
Ratio of anodic to cathodic areas pH Marks)
18CHE12/22
Module-3
5. a. Define the term Calorific value of fuel. Explain the experimental determination
of calorific value of solid/liquid fuel using Bomb calorimeter. Marks)
b. What are fuel cells? Describe the construction and working of CH3OH-O2 fuel cell.
marks)
c. What are solar cells? Explain the construction and working of a typical PV cell.
marks)
OR
6.
a. Explain the production solar grade Si by union carbide process
b. 0.75 g of coal sample (carbon H2 and ash was
subjected to combustion in Bomb calorimeter. Mass water taken in
the calorimeter was 2.5Kg and the water equivalent of calorimeter is
0.65Kg. The rise in temperature was found to be 3.2oC. Calculate
gross and net calorific values of the sample. Latent heat of steam
=2457KJ/Kg and specific heat of water 4.187KJ/ Kg/oC. Marks)
marks)
c. What i s knocking? Explain its mechanism. Mention its ill effects.
Marks)
Module-4
7 a. Explain the mechanism of photochemical smog? Marks)
b. What are the sources, effects and control of lead pollution? Marks)
c. Define COD. In COD test 27.5 cm3 and 13.2 cm3 of 0.05 N FAS solution ere required
for blank and sample titration respectively. The volume of the test sample used is 25
cm3. Calculate the COD of the sample solution. Marks)
OR
8. a. Define the term COD. Explain the determination of COD. Marks)
b. What is potable water? Describe the process of reverse osmosis process of water.
Marks)
c. What are the causes, effects and disposal methods of e-waste? Marks)
Module-5
9. a. Explain the theory, instrumentation and applications of flame photometry.
Marks)
b. Explain the theory and instrumentation of conductometry. Marks)
c. Explain the synthesis of nano-material by sol-gel technique. Marks)
10. a.
OR
Write a note on graphenes. Mention its applications. Marks)
b. What are nano-materials? Explain the synthesis of nano-materials by
precipitation method Marks)
c. Explain the theory and instrumentation of potentiometry. Marks)