LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIFTH SEMESTER – APRIL 2012

CH 5507 – PHASE EQUILIBRIA AND KINETICS

 

 

 

Date : 30-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

 

Answer ALL questions:                                                                                      (10 x 2 = 20 marks)

 

1. Define congruent melting point.
2. State phase rule and mention the terms involved in it.
3. What are isotonic solutions?
4. What do you mean by abnormal Colligative properties?
5. What are zero order reactions? Give an example.
6. Bring out the differences between order and molecularity of a reaction.
7. State the steps that are involved in the thermal docomposition of acetaldehyde.
8. Explain how ionic strength affects the rate of a reaction in solution.
9. What is heterogenous catalysis?
10. Define the term Adsorption.

PART – B

Answer any EIGHT questions:                                                                           (8 x 5 = 40 marks)

 

11. Apply phase rule to water system. Draw the phase diagram of it.
12. Explain phase rule to lead-silver system and discuss the desilverisation of lead from this

system.

13. State and explain Raoult’s law.
14. The molar heat of vaporization of water at 100^oC is 40.585 kJ mol^-1. At what temperature

will a solution containing 5.60 g of glucose per 1000 g of water boil?

15. What are azeotropes? Explain.
16. Derive the expression for the rate constant for the reaction 2A -> products.
17. Calculate the activation energy of a reaction whose rate constant is tripled by a 10^oC rise in

temperature  from the initial temperature of 27^oC.

18. Explain the kinetics of parallel reaction with one example.
19. Explain the theory of absolute reaction rate and show how it is superior to other theories.
20. Explain the kinetics of acid catalysed ester hydrolysis.
21. State and explain the factors that affect the rate of enzyme catalysis.
22. What are Wilkinson’s catalysts? Explain its catalytic action in reactions.

PART – C

Answer any FOUR questions:                                                                          (4 x 10 = 40 marks)

 

23. Draw and explain the phase diagram of FeCl₃-H₂O system.

 

24. (a) Derive Clausius-Clapeyron equation and state any one of its applications.

(b) Explain partially miscible binary systems with suitable examples.

 

25. (a) Derive Nernst distribution law and state its limitations.

(b) Discuss on steam distillation.

 

26. (a) Explain the differential method of determination of order of a reaction.

(b) Explain the effect of solvent on the rate on S_N2 reaction.

 

27. (a) Explain Lindemann’s steady state principle.

(b) State the postulates of Langmuir’s adsorption equation and derive the equation.

 

28. Discuss the kinetics of enzyme catalysis with Michaelis – Menton mechanism. How are the

rate constants evaluated?

 

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIFTH SEMESTER – NOVEMBER 2012

CH 5507 – PHASE EQUILIBRIA AND KINETICS

 

 

 

Date : 06/11/2012             Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

 

Answer ALL questions:                                                                                           (10 x 2 = 20 marks)

 

1. Define the term phase.
2. What is congruent melting point?
3. State Raoults’ law.
4. In the distillation of liquid L by steam, the mixture boils at 99^oC at a pressure 760 mm. At this

temperature the vapour pressure of water is 733 mm.   The composition of distillate is H₂O; L = 4:1.

Calculate the molecular weight of liquid L from this data.

5. Define the order of a reaction.
6. What are pseudo first order reactions? Give an example.
7. Write the Arrhenius equation and define the terms involved in it.
8. What are parallel reactions? Give an example.
9. What is acid-base catalysis?
10. What is Wilkinson’s catalyst? Write one application of it.

 

PART – B

 

Answer any EIGHT questions:                                                                               (8 x 5 = 40 marks)

 

11. Derive Clausius – Clapeyron equation. Give its applications.
12. Discuss the salient features of the phase diagram of Lead-Silver system.
13. Explain critical solution temperature. What is the effect of addition of solute on it?
14. Discuss Van’t Hoffs’ theory of dilute solutions.
15. A solution containing 3.975 g of sulphur in 100 g of CS₂ boils at 319.67 K. The boiling point of pure

CS₂  is 319.30 K  and ΔH_vap = 27.78 kJ mol^-1.   Calculate the molecular formula of sulphur in carbon

disulphide.

16. Derive the rate constant for First order reaction.
17. A second order reaction in which the initial concentrations of both the reactants are equal (i.e. a = b =

1 mol dm^-3) proceeds to an extent of 25% in 5 hrs.   How long will it take for the reaction to be

completed to the extent of 60%?

18. Explain the reversible reaction with an example.

 

19. Discuss the ARRT in detail.
20. Explain the steps involved in the thermal dissociation of acetaldehyde reaction.
21. Discuss the homogenous catalysis with an example.
22. Explain the Langmuir’s unimolecular adsorption isotherm.

 

PART – C

 

Answer ANY FOUR questions:                                                                              (4 x 10 = 40 marks)

 

23. Explain and draw the phase diagram of Ferric – Chloride – water system.

Apply the relevant phase rule equation.

 

24. Write notes on any TWO:
25. a) Solvent Extraction
26. b) Phase diagram of three component system
27. c) Nernst distribution law
28. d) Phase diagram of Sulphur system.

 

25. Derive thermodynamically the relationship between elevation in boiling point of a solution and its

molality.

 

26. Explain any THREE methods of determining order of a reaction.

 

27. Explain the collision theory of bimolecular and unimolecular reactions.

 

28. Derive Michaelis – Menton equation and discuss the kinetics of enzyme catalysis.

 

 

 

 

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