LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

WD 25A

FIFTH SEMESTER – April 2009

CH 5507 – PHASE EQUILIBRIA AND KINETICS

 

 

 

Date & Time: 24/04/2009 / 1:00 – 4:00   Dept. No.                                                      Max. : 100 Marks

 

 

 

PART – A

Answer ALL questions                                                                                 (10 X 2 = 20)

 

• Identify the number of phases and components at equilibrium

CaCO_3(s)                       CaO_(s)   +   CO_2(g)

2)      Apply phase rule equation at the triple point of water.

3)      What are isotonic solutions?

4)       A solution of 0.1 M NaCℓ aqueous solution has a boiling point of 101.04^o C. What will be the boiling point of 0.2 M urea solution Kb = 0.52K kg mol ^-1?

5)      Define rate constant of a reaction.

6)      What is a zero order reaction?

7)      Calculate the ionic strength of 0.1 m BaCℓ₂ solution at 25^o C

8)      Enzyme catalysis decelerates at high temperatures.  Why?

9)      What is Wilkinson’s catalyst?

10) Distinguish between adsorption and absorption.

PART – B

Answer ANY EIGHT questions only                                                                      (8 X 5 = 40)

 

• Draw and describe phase diagram of Pb – Ag system

12)  Explain the phase behavior of a three component system.

13)  What is an azeotrope?  Explain azeotropic distillation with an example.

14)  Derive Nernst Distribution law.

15)  What are chain reactions. Explain with an example.

16)  There is a first order dependence on concentration of KI and K₂S₂O₈.  If the initial concentration of K₂S₂O₈ is ‘a’ moles dm^-3 and KI is ‘2a’ moles dm^-3.   Derive the expression for the rate constant of the reaction.

17)  Explain the terms order, molecularity and stoichiometry of a reaction with a suitable example.

18)  Explain the kinetics of parallel reactions with an example.

19)  State steady state approximation.  Illustrate with an example

20)  The specific rate of decomposition of HI at 556 K & 781 K are 3.517 X10^-7 dm³ mol^-1 s^-1 and     3.954 X 10^-2 dm³ mol^-1 s^-1 respectively.  Calculate energy of activation in cal mol^-1 and Arrhenius pre-exponential factor A in dm³ mol^-1 s^-1.

 

 

21)  Explain the kinetics of acid catalysed ester hydrolysis.  How the order with respect to each reactant is determined.

22)   Distinguish between physisorption and chemisorption.

 

PART C

Answer ANY FOUR questions only                                                                       (4 X 10 = 40)

 

23)  Draw the phase diagram of FeCℓ₃ – water system and apply phase rule.

24)  Derive the relation between elevation of boiling point and morality of the solution, thermodynamically.

25)  Explain any two of the following:                                                                                                        a) Phase diagram of partially miscible liquid pair exhibiting both UCST & LCST                                  b) Application of distribution law to KI  +  I₂              KI₃ equilibrium                                               c) Raoults law and its deviations                                                                                                        d) Application of Clapeyron equation

26)  A) Describe Van’t Hoff differential method of determination of order of a reaction                                              B) Explain one mechanism of bimolecular surface reaction.

27)  Discuss the kinetics enzyme catalysis as propounded by Michaelis Menton in detail.

How the rate constants of individual steps are evaluated.

28)  State the postulates of Langumir adsorption isotherm and hence derive the equation and explain.

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