B.Sc Chemistry Physical Chemistry Question Paper 2007

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc.

LM 13

DEGREE EXAMINATION –CHEMISTRY

FIFTH SEMESTER – APRIL 2007

CH 5500 – PHYSICAL CHEMISTRY – II

 

 

Date & Time: 27/04/2007 / 1:00 – 4:00          Dept. No.                                                     Max. : 100 Marks

 

 

 

PART – A

Answer ALL questions.                                              (10 ´ 2 = 20 marks)

 

1. What is primary reference electrode? What is its SRP ?
2. Define chemical cell. Give an example.
3. Draw the graph of pH vs  volume of alkali added for a potentiometric acid–base  titration.
4. Calculate the ionic strength of 0.02M Na₂SO₄.
5. Define transport number.
6. What is a pseudo–order reaction? Give one example.
7. What is the effect of ionic strength on the rate constant of the reaction

S₂O₈^2– + 2I^–  ®   2SO₄^2– + I₂?

 

8. Mention the order and molecularity for a reaction proceeding through S_N2
   mechanism.
9. Define quantum yield of a photochemical reaction.
10. What is an adsorption isobar?

 

PART – B

Answer any EIGHT questions.                                   (8 ´ 5 = 40 marks)

 

11. Explain an experimental method of determining the standard reduction potential
    of Cu electrode.

 

12. Derive the relation between emf and (i) Equilibrium constant  (ii)  DS
13. Calculate the emf of the following cell Cd½Cd²⁺(0.01 m)½½Cd²⁺ (0.001 m)½Cd
14. How will you determine the K_sp of AgI.
15. Explain Arrhenius theory of electrolyte dissociation. Give evidences in favour of it.

 

16. Define equivalent conductance. Explain its variation with respect to
    concentration for  (i)  CH₃COOH  (ii)  HCl

 

17. The rate constant of a second order reaction of the type A + B ® products is
    given by the expression  log₁₀k  =   + 12.

The time is in minutes while the concentration of each is 0.008 M.  Calculate
the energy of activation and the half life at 10° C (Use R = 2 cal K^–1 mol^–1).

 

18. Write briefly on the kinetics of parallel reactions with one example.
19. Differentiate physisorption from chemisorption.
20. How is order of a reaction determined experimentally using “half life” method?

 

21. Compare collision theory of bimolecular reactions with ARRT.
22. Derive Langumir adsorption isotherm equation.
23. Explain chemiluminescence with two examples.

 

 

PART – C

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

 

24. (a) Derive Nernst equation.

(b) Calculate the emf of hydrogen electrode at pH = 2.

 

25. (a) Explain the determination of pH using quinhydrone electrode.

(b) How will you prove electrochemically that mercurous ion exists as .

 

26. (a) Explain Debye theory of activity coefficient.

(b) Calculate the mean activity of 0.05 m Al₂(SO₄)_3.

 

27. Explain the kinetics of unimolecular reactions.

 

28  Derive Michaelis – Menton equation for a single substrate enzymatic reaction
and explain.

 

29. Explain the mechanism of bimolecular surface reactions with one example for
    each.

 

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