M.Sc. (Semester III) (CBCS) Examination Mar/Apr-2018
Physical Chemistry
ELECTROCHEMISTRY
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Attempt any two questions from Section I and any two questions from Section II. Figures to the right indicate full marks. Neat and labeled diagram should be drawn. Use of calculator and log table is allowed.
Section I
Q.1
Answer the following.
14
How do you verify the Debye-Huckel Onsger equation?
As the concentration of electrolyte increases the thickness of ionic atmosphere decreases. True or False
The mobility of ion due to electrophoretic force.
(Decreases /increases)
Write the Debye-Huckel Limiting law for a single ion.
What is the value of rmin according to Bjerrum's theory?
In Gemini and Appolo fuel cell what are the fuels used?
Write the expression for hydration energy according to Born Habber method.
Name the primary slow step in the theories of overvoltage.
The mobile phase in electrophoresis is
Which electrolyte is used in natural gas CO-Air fuel cell?
The electrocapillary curve is obtained by plotting against
The slope of Tafel plot for overvoltage is
Define hydration number.
How do you obtain Pourbaix diagrams?
Section II
Q.2
Give an account of the qualitative and quantitative verification of Debye Huckel equations for their suitable electrolytes.
07
State various forms of activity coefficient and explain their interrelationship. The activity coefficient of ion and ion pairs are 0.827 and 0.88 respectively for 0.5 m KCl. If the fraction of association is 0.021. Calculate association constant.
07
Q.3
Explain in detail the techniques of electrotyping along with advantages.
07
Discuss the thermodynamic parameters towards the ion solvent interaction.
07
Q.4
Define polarization. What are the types of it and explain any one in brief.
07
Describe in brief the importance and theory of diffusion over potential.
07
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SLR-UF-210
Section III
Q.5
Explain the role of electrolysis in electrometallurgy.
05
Discuss in brief the molten carbonate fuel cell.
05
The efficiency of fuel cell is 92% and the standard enthalpy change of two electron reaction is 68 Kcal/mole. Calculate the equilibrium potential of the fuel cell.
04
Q.6
Give the importance of design and material selection in controlling corrosion.
05
What is electrokinetic potential? Explain in detail electro-osmosis.
05
How do you determine the zeta potential experimentally
04
Q.7
Write a note on any Three of the following.
14
H2-O2 fuel cell
Electrical double layer concept
Kinetics of discharge of hydrogen ions
Bernal Fowler method