LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – CHEMISTRY

DB 12

FIFTH SEMESTER – November 2008

CH 5507 – PHASE EQUILIBRIA AND KINETICS

 

 

 

Date : 07-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART A

Answer ALL the questions                                                                        10X2=20

 

1. What is condensed phase rule equation.
2. Find out the number of components in           (i) CaCO₃(s) CaO(s)+ CO₂(g)

(ii)NH₄Cl(s)  NH₃(g)  + HCl(g)

1. Define vapour pressure of a liquid?
2. Give two limitations of Nernst distribution law.
3. Distinguish between order and molecularity.
4. Give an example each for first order and zero order reactions
5. How does ionic strength affect the rate of a reaction?
6. What is adsorption?
7. Cite an example for homogeneous and heterogeneous catalysis.
8. Mention the characteristic features of enzyme catalysis.

 

PART B

Answer any EIGHT questions                                                                     8X5=40

 

1. The melting point of ice is higher than that of ice mixed with salt. Why?
2. Discuss the salient features of the phase diagram of Pb-Ag system
3. How will you obtain absolute alcohol from rectified spirit?
4. 1.1 g of a protein were dissolved in 100 mL of solution. The osmotic pressure at 25˚C was measured as 1150 Nm^-2. What is the molar mass of the protein?
5. Describe any one method of determination of order of a reaction.
6. Obtain the integrated rate equation for a second order reaction 2Aproducts.
7. Compare and contrast absolute reaction rate theory and collision theory.
8. A first order reaction has a half life of 30 minutes at 27˚C. Its rate constant at 47˚C is 1.15X10^-3 sec^-1. Calculate the energy of activation.
9. Derive Langmuir’s adsorption isotherm equation.
10. Explain kinetics of bimolecular surface reactions with one example.
11. Discuss the significance of     (i) Raoult’s law

(ii) Henry’s law

1. Enumerate the steps involved in thermal dissociation of acetaldehyde.

 

 

PART C

Answer any FOUR questions                                           4X10=40

 

23. Derive Michaelis Menten equation for the kinetics of enzyme catalysis.
24. Explain Lindemann hypothesis with reference to the kinetics of unimolecular reactions.
25. (a) At 27°C in the presence of a catalyst, the activation energy of a reaction is lowered by 2 k cal. Calculate by how many times the rate of the reaction increases by the presence of this catalyst.            (5)

(b) Differentiate physisorption from Chemisorption.                        (5)

1. (a) Draw the phase diagram of water system and explain.                 (5)

(b) Derive Nernst distribution law                                                      (5)

1. (a) Discuss the principle and experimental method involved in fractional

Distillation of a binary liquid mixture.

(b) Derive phase rule equation                                                            (5)

1. Derive thermodynamically the relation between elevation in boiling point and morality.