LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

GH 10

THIRD SEMESTER – APRIL 2008

CH 3500 – PHYSICAL CHEMISTRY – I

 

 

 

Date : 26/04/2008                Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

part – a

            answer ALL the questions.                                                 (10 ´ 2 = 20 marks)

 

1. Write van der Waal’s equation for ‘n’ moles of the gas and mention the terms involved.
2. Calculate DS for the vapourisation of 1 mole of H₂O(l) at 373 K.

DH_vap = 9720 cal/mol.

3. State Hess’s law of constant heat summation.
4. What is the effect of pressure on the system PCl_5(g) ⇌ PCl_3g) + Cl_2g) at equilibrium?
5. What is chemical potential? Is it extensive or intensive?
6. State reduced phase rule equation.
7. State Henry’s law.
8. What are colligative properties? Give two examples.
9. Define partition coefficient.
10. What is meant by thermodynamic equilibrium constant?

 

PART – B                             (8 ´ 5 = 40 marks)

              Answer any EIGHT questions.

 

11. State any five postulates of kinetic theory of gases.
12. Derive Gibb’s-Helmohltz equation.
13. Draw the phase diagram for water system and apply the phase rule equation to any one point, one line and one area.
14. 1 mole of an ideal, monoatomic gas expands isothermally and reversibly at 27°C from 10 to 100 lit. Calculate q, w, DE, DH and D
15. Differentiate bond energy from bond dissociation energy with a specific example.
16. State Raoult’s law and explain positive deviation from it.
17. How is osmotic pressure of a solution determined experimentally?
18. Derive the relation DG = DG° + RT ln Q and hence deduce an expression for thermodynamic equilibrium constant.
19. State III law of thermodynamics and explain.
20. Explain the phase diagram of phenol-water system.
21. Calculate the freezing point of 0.01 m aqueous solution of K₄[Fe(CN)₆] assuming 80% ionization. k_f for H₂O is 1.86 K kg mol^-1.
22. Derive Nernst distribution law.

 

 

PART – C

            Answer any FOUR questions.                                 (4 ´ 10 = 40 marks)

 

23. Derive Maxwell equations from first principle.
24. Deduce van der Waal’s equation.

 

25. Derive any two of the following. (5 + 5)

(a) PV^g = constant                              (b) Kirchoff’s equation

(c) relation between K_p and K_c             (d)

26. Draw the phase diagram of a simple eutectic system and discuss its salient features.
27. Derive thermodynamically the relation connecting elevation of boiling point of a solution and molality.
28. Explain any two of the following: (5 + 5)

(a) Gibb’s phase rule equation            (b) Azeotropes

(c) Joule-Thomson coefficient           (d) van’t Hoff factor.

 

 

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