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PG – 720

*PG720*

II Semester M.Sc. Degree Examination, July/August 2013 (RS) (2006-2007 Onwards) CHEMISTRY C – 203 : Physical Chemistry – II Time : 3 Hours

Max. Marks : 80

Instruction : Answer question number 1 and any five of the remaining. 1. Answer any ten of the following :

(10×2=20)

a) Write the Huckel Bronsted equation and state the terms. b) Give the electrocapillary Lipmann’s equation. c) What are the factors which affect the exchange current density ? d) Explain the Helmholtz-Perrin’s theory. e) What is meant by concentration polarization ? f) What is meant by partition function ? g) What are ensembles ? h) How is fugacity different from activity ? i) Differentiate molar volume with partial molar volume. j) Distinguish between reversible and irreversible process. k) What are thermodynamic excess functions ? l) Explain the term over voltage. 2. a) Obtain an expression to determine activity coefficient from EMF measurement. b) Derive Gibb’s-Duhem equation and give its significance.

(6+6=12)

3. a) Derive Bose-Einstein attribution law. b) Describe Onsagar’s phenomenological equations as applied to coupled processes. (7+5=12) P.T.O.

*PG720*

PG – 720

4. a) Derive an expression for the vibrational partition function. Calculate the Qvib for CO at 300 K, if its frequency of vibration is 6.5 × 1013S−1. b) What is the principle of triangular diagram ? Draw the triangular phase diagram comprising of a ternary system. (6+6=12) 5. a) Derive the Debye-Huckel limiting law and state its limitations. b) Describe the Byerrum theory of ion association triple ions and conductance minima. (6+6=12) 6. a) Describe the Stern theory of double layer. b) Explain the determination of anode and cathode overpotentials.

(6+6=12)

7. a) Describe the theory of overvoltage for combination of atoms. b) Derive Butler-Volmer equation.

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(6+6=12)