Model Question Paper-2 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-I
1. a. What is single electrode potential? Derive Nernst equation for single electrode potential. Marks)
b. Calculate the emf of a Cd-Cu cell in which Cd is in contact with 0.002 M CdSO4 and
Cu in contact with 0.02 M CuSO4 solution. The standard emf of the cell is 0.74 V at
298 K Marks)
c. Explain the construction and working of Ni-MH battery, mention its applications.
Marks)
OR
2. a. Explain the construction and working of Li-ion battery. Mention their advantages and
applications. Marks)
b. What are primary and secondary batteries? Explain with examples. Marks)
c. A concentration cell was constructed by immersing two silver electrodes in 0.05 M and
1M AgNO3 solutions. Give the cell representation, write the cell reactions and calculate
the emf of the cell Marks)
Module-II
3. a. Explain: Water-line corrosion Pitting corrosion. Marks)
b. Explain the process of galvanization Anodizing Marks)
c. What is electrolessplating? Explain the electrolessplating of nickel. Marks)
OR
4. a. What is meant by metal finishing? Mention (any technological importance
of metal finishing. Marks)
b. Define the terms Polarization, Decomposition potential Over voltage.
Marks)
c. What is cathodic protection? Explain Sacrificial anodic Impressed
current methods Marks)
Module-III
5. a. What are chemical fuels? How are they classified? Marks)
b. What are fuel cells? How does a fuel cell differ from a battery? Give their advantages
disadvantages. marks)
c. Explain the preparation of solar grade silicon by union carbide process. marks)
OR
6.
a. What are PV cells? Mention their advantages and limitations.
b. 0.85 g of coal sample (carbon H2 and ash was
subjected to combustion in a Bomb calorimeter. Mass water taken in
the calorimeter was 2000 g and the water equivalent of calorimeter
was 600 g. The rise in temperature was found to be 3.5oC. Calculate
gross and net calorific values of the sample. Latent heat of steam =2457KJ/Kg.
Marks)
marks)
c. Write a note on Power alcohol Unleaded petrol
Marks)
Module-IV
7 a. What are the causes, effects and disposal methods of e-waste? Marks)
b. What are the sources, effects and control of mercury pollution? Marks)
c. In a COD test 30.2 cm3 and 14.5 cm3 of 0.05 N FAS solution are required
for blank and sample titration respectively. The volume of the test sample used was 25
cm3. Calculate the COD of the sample solution. Marks)
OR
8. a. Explain the softening of water by ion exchange method. Marks)
b. Explain the activated sludge treatment of sewage of water. Marks)
c. Explain the mechanism of photochemical smog. Marks)
Module-V
9. a. Explain the theory, instrumentation and applications of atomic absorption spectroscopy. Marks)
b. Explain the theory and instrumentation of potentiometry Marks)
c. Explain the synthesis of nano-material by sol-gel technique. Marks)
10. a.
OR
Write a note on fullerenes. Mention their applications.
Marks)
b. What are nano-materials? Explain the synthesis of nano-materials by
chemical vapor deposition.
Marks)
c.
Explain the theory and instrumentation of colorimetry.
Marks)