M.Sc.DEGREE EXAMINATION, NOVEMBER 2017
Third Semester
Chemistry
Elective CORROSION CHEMISTRY
(CBCS 2014 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. What is meant by corrosion? How are corrosions
classified?
2. What is pitting?
3. Define atmospheric corrosion.
4. How does salt affect the rate of corrosion?
5. Define energy density
6. A copper equipment should not possess a small steel bolt.
Why?
7. What is the advantage of using Phosphoric acid
electrolyte in the place of KOH in hydrogen-oxygen fuel
cell?
8. What is salt bridge?
9. What are fuel cells?
10. What is the working temperature and power produced in
alkaline fuel cells?
Sub. Code
4MCH3E1
AFF-4889
2
Wk 3
Part B x 5 25)
Answer all questions choosing either or
11. Explain the theory of passivity.
Or
Discuss the factors that affect the rate of corrosion.
12. Discuss the factors influencing atmospheric
corrosion.
Or
Write a note on Biological corrosion.
13. Derive the relation between free energy and Ecell.
Or
Explain the various types of primary and secondary
cells.
14. Explain the performance characteristics of Zinc/air
cells.
Or
Discuss the types of chemicals and metals inside the
battery that are used to store and release energy.
15. Discuss the construction of alkaline fuel cell.
Or
Write a note on Mercury Porosimetry.
AFF-4889
3
Wk 3
Part C x 10 30)
Answer any three questions.
16. Explain the control methods of stress corrosion and
dezincification.
Discuss the mechanism of film form corrosion and
erosion corrosion.
17. Define soil corrosion. Mention the factors
influencing the soil corrosion.
In what ways, temperature and pH affect the rate of
corrosion?
18. What are electrolytes? How are they classified? Explain
the mechanism of any two types. 2
19. Explain the construction and working of the following
storage devices
Ni-Fe
Laclancy dry cells.
20. What are the advantages of fuel cell? Discuss the
construction and working of solid oxide fuel cell.
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