*PG211* IV Semester M.Sc. Examination, June 2016 (CBCS) CHEMISTRY C-401-PC : Applied Electrochemistry Time : 3 Hours
Max. Marks : 70
Instruction : Answer any 10 sub-questions from Question No. 1 and any 5 from the remaining questions. 1. Answer any ten of the following questions.
(10×2=20)
a) What is half wave potential ? Mention its analytical significance. b) How do you test the reversibility of a process by chronopotentiometry ? Explain. c) What are hydrodynamic electrodes ? Give examples. d) Calculate the power density of a battery when it is discharging at a current of 1.25 A with an average voltage of about 1.5 V for about 2 hours. The weight of the battery is 1 Kg. e) Comment on the thermodynamic efficiency of a fuel cell. f) Give the representation and reactions of solid-oxide fuel cell. g) Define current density and indicate its importance in electrodeposition. h) How is the porosity of a coat tested ? i) Mention the special features of electrochemical synthesis compared to conventional synthesis. j) Give reasons for the following : i) Corrosion starts from the tip of the cracks ii) Iron article at the beach side undergoes corrosion at faster rate than the one at dry weathered place. k) What are pourbaix diagrams ? Mention their importance. l) How does the electron transport occur in biological systems ? Explain. P.T.O.
PG – 211
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*PG211*
2. a) Explain the ‘adsorption current’ and ‘kinetic current’, which can be formed at DME in polarography. b) Discuss the principle and advantage of differential pulse polarography. c) Outline the technique of anodic stripping voltammetry.
(4+3+3)
3. a) How is the coupled chemical reaction of the type CrEr studied by cyclic voltammetry ? Explain. b) What are ion-selective membrane electrodes ? Give their classification with examples. c) Give the construction and reactions of Zinc-Silver oxide primary battery. (4+3+3) 4. a) Explain the modern technology involved in metal-air batteries with suitable example. b) Why Lithium is extensively used in battery technology ? Discuss the working mechanism of Lithium-ion battery. (4+6) 5. a) What are the electrochemical super capacitors ? Compare them with batteries. b) What are PEM fuel cells ? Explain the construction and working of H2 – O2 fuel cell. c) Discuss the mechanism of electro deposition.
(3+4+3)
6. a) What is Throwing power of a plating bath ? Calculate the percentage of throwing power of a bath solution when the results obtained by placing the cathodes C1 and C2 at the distance 6 cm and 3.5 cm from the anodes and the weights deposited on these cathodes are 0.78 g and 1.56 g respectively. b) Give an account on each of the following : i) treatment of toxic cyanide of the electroplating industry ii) surface analysis of coatings by XPS technique.
(4+6)
*PG211*
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PG – 211
7. a) Discuss the Kolbe’s process of electro-organic synthesis. b) Outline the local-cell theory of corrosion. c) Calculate the change in free energy associated with the corrosion of Iron container when the cell potential is 3.25 V. Comment on the thermodynamic stability of the metal. (3+4+3) 8. a) Describe the cathodic protection technique of corrosion control. b) Sketch the current potential diagram and explain the active-passive behaviour of the metals or alloys. c) Write a note on bioelectroanalysis. ———————
... cell potential is 3.25 V. Comment on the thermodynamic. stability of the metal. (3+4+3). 8. a) Describe the cathodic protection technique of corrosion control.
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e) What is Pourbaix diagram ? Mention its significance. f) Draw E-I curve and give the meaning of the active and passive regions. g) What do you mean by the ...
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