18CH12 / 16CH12
USN
RV COLLEGE OF ENGINEERING®
(An Autonomous Institution affiliated to VTU)
I Semester B. E. Examinations Nov/Dec-19
Common to All Branches
ENGINEERING CHEMISTRY
Time: 03 Hours Maximum Marks: 100
Instructions to candidates:
1. Answer all questions from Part A. Part A questions should be
answered in first three pages of the answer book only.
2. Answer FIVE full questions from Part B. In Part B question number 2,
7 and 8 are compulsory. Answer any one full question from 3 and 4
&one full question from 5 and 6.
PART-A
1 1.1 Identify any one reason for the choice of 𝐶𝐶𝐶𝐶𝐶𝐶𝑂𝑂3 equivalence to express
the Total hardness of water. 01
1.2 Write the structure of polysulfone used in reverse osmosis. 01
1.3 Which ion act as the charge carrier in Methanol Oxygen fuel cell with
𝐻𝐻2 𝑆𝑆𝑂𝑂4 electrolyte? 01
1.4 Write the redox electrode system exists before the complete oxidation
of Fe2+ ion in potentiometric experiment. 01
1.5 Two metallic designs made up of 𝐹𝐹𝐹𝐹/𝐶𝐶𝐶𝐶 and 𝐹𝐹𝐹𝐹/𝐴𝐴𝐴𝐴, are exposed to
corrosion environment. Identify the metal which corrodes at a faster
rate. 𝑆𝑆𝑆𝑆𝑆𝑆 of Iron < Copper < Silver. 01
1.6 What is meant by throwing power in electrode position process of
metals? 01
1.7 Write the name of the precursor used in the synthesis of 𝑀𝑀𝑀𝑀𝑀𝑀
nanoparticles by combustion method. 01
1.8 What is meant by surface plasmon resonance? 01
1.9 Write the structure of monomer, which is used in both polycarbonate
and epoxy resin synthesis. 01
1.10 Photo conducting polymers are used in printing. Name any one such
polymer. 01
1.11 Octane number is an arbitrary scale for expressing the knocking
characteristics of gasoline in combustion engine. Write the structure
of two chemicals used to determine octane number. 02
1.12 Write any two roles of salt bridge in Electrochemical Cells. 02
1.13 The corrosion of iron increases with decrease in 𝑝𝑝𝑝𝑝. Justify. 02
1.14 Write the expression for Beer-Lamberts Law and explain the terms
involved. 02
1.15 Mention any two applications of Biodegradable polymers in medical
Industry. 02
PART-B
2 a 𝐵𝐵𝐵𝐵𝐵𝐵 indicates the amount of decomposable organic matter or extent
of pollution or amount of dissolved oxygen in the sewage. Explain in
detail the experimental procedure involved in the determination of
𝐵𝐵𝐵𝐵𝐵𝐵 of waste water sample. 05
b Explain the construction and working of amorphous silicon solar cells
with a neat labeled diagram. 05
c During determination of 𝐶𝐶𝐶𝐶𝐶𝐶, 25𝑐𝑐𝑚𝑚3 of sewage sample is reacted with
25𝑚𝑚𝑚𝑚 of 𝐾𝐾2 𝐶𝐶𝐶𝐶2 𝑂𝑂7 solution and the unreacted 𝐾𝐾2 𝐶𝐶𝐶𝐶2 𝑂𝑂7 requires 8.0𝑐𝑐𝑚𝑚3 of
𝑁𝑁/4 𝐹𝐹𝐹𝐹𝐹𝐹 solution. Under similar conditions, in blank titration 14.0𝑚𝑚𝑚𝑚
of 𝐹𝐹𝐹𝐹𝐹𝐹 is used up. Calculate the 𝐶𝐶𝐶𝐶𝐶𝐶 of the sample. 04
d Write the reaction involved in the synthesis of Biodiesel. 02
3 a When a metal is in contact with its metal ion solution, a potential is
developed due to formation of 𝐻𝐻𝐻𝐻𝐻𝐻 layer. Derive an expression which
relates reduction potential of metal and its concentration at 298𝐾𝐾
using Vant Hoff’s equation. 05
b The pH of solution is measured by using glass electrode. Discuss the
construction and working of glass electrode. Why glass electrode is
not preferred measurement in water containing fluoride ion? 05
c Discuss the construction and working of calomel electrode. Give its
Nernst’s equation. 04
d Bring out the difference between fuel cell and battery. 02
OR
4 a Lithium ion batteries are used in almost all electronic gadgets due to
its high power density. Draw a neat labeled diagram and explain
discharging and charging reactions of 𝐿𝐿𝐿𝐿 − 𝐶𝐶𝐶𝐶𝑂𝑂2 battery? 05
b Write the half cell and net cell reactions for the cell 𝐶𝐶𝐶𝐶(𝑠𝑠) /
+2 +2
𝐶𝐶𝑑𝑑 (0.01𝑀𝑀)//𝐶𝐶𝑢𝑢 (0.5𝑀𝑀)/𝐶𝐶𝑢𝑢(𝑠𝑠) The standard reduction potentials of
𝐶𝐶𝐶𝐶 and 𝐶𝐶𝐶𝐶 are −0.4𝑉𝑉 and 0.34𝑉𝑉 respectively. Calculate the emf of the
cell. 05
c Fuel cells are considered to be the future of alternative source of
energy. With the help of a neat labeled diagram explain the
construction and working of methanol-oxygen fuel cell. 04
d What are reserve batteries? Give one Example. 02
5 a A metal window grill exposed to wet aerated environment may
undergo rusting. With a neat labeled diagram propose the possible
mechanism. Interpret the results of rusting process with anodic and
cathodic reactions. 05
b What is electroless plating? Mention any three differences of
electroless plating over electroplating 05
c Explain anodic metal coating by taking galvanization process as an
example. 04
d Identify the anodic and cathodic area in:
i) Iron rod partially immersed in polluted water
ii) Bent iron rods in corrosive environment. 02
OR
6 a Discuss the process of electroless plating technology of copper and
explain its application in the manufacture of 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃. 05
b Corrosion on a metal progresses based on the favorable conditions to
which the metal is exposed. Write a brief note on the effect of
following factors on the rate of corrosion:
i) Nature of corrosion product
ii) Relative anodic and cathodic area and
iii) Temperature. 05
c Explain the process of phosphating of iron article. 04
d Write any two organic additives used in electroplating process of
metals. 02
7 a 𝑇𝑇𝑇𝑇𝑂𝑂2 nanomaterial used in energy harvesting devices is generally
prepared by sol-gel method. Explain the reactions and steps involved
in this process. 05
b Discuss the preparation of carbon nanotubes (𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶) by chemical
Vapour Deposition Technique. Mention any two properties of 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶. 05
c Discuss in detail the principle and instrumentation of 𝑈𝑈𝑈𝑈 Visible
spectroscopy. 04
d Mention any two factors affecting the conductance of a solution. 02
8 a Glass transition temperature (𝑇𝑇𝑔𝑔 ) is essential for optimizing
processing parameters of polymers. What is 𝑇𝑇𝑔𝑔 ? Explain any two
factors influencing 𝑇𝑇𝑔𝑔 of a polymer. 05
b Discuss the following mechanism:
i) Conduction in polyacetylene
ii) Synthesis of Polyaniline. 05
c Give the reaction in the synthesis of:
i) 𝐴𝐴𝐴𝐴𝐴𝐴 polymer
ii) Epoxy resin. 04
d Write the reaction for the synthesis of polycarbonate. 02
