Register Number
SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act,1956)
Course & Branch :B.Tech - P-CHEM
Title of the Paper :Physical Chemistry
Sub. Code :SCHX1006 (2010-11)
Date :10/12/2011
Max. Marks:80
Time : 3 Hours
Session :FN
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1.
PART - A
Answer ALL the Questions
What is Reduced phase rule
(10 x 2 = 20)
2.
State Rauolts’s law for vapour pressure lowering
3.
How does a catalyst increase the rate of reaction?
4.
The rate constant for a first order reaction is 1.54 x10-3S.
Calculate its half time.
5.
What are colloids? How are they classified?
6.
Mention the properties of colloids
7.
Differentiate between Strong electrolyte and Weak electrolyte
8.
Calculate the pH of 0.1N HCl
9.
State Faraday’s second law with mathematical expression
10. What is the potential of a half cell consisting of 0.01M CuSO4
solution at 250C(E0Cu = -0.337V)
PART – B
Answer All the Questions
(5 x 12 = 60)
11. For an ideally dilute solution the solvent obeys Raoults law and
solute Henry’s law – Justify this statement.
(or)
12. Explain the term molal elevation constant. Derive the relationship
between boiling point elevation of a solution and mole fraction of
the dissolved solute.
13. What is second order reaction? Derive an expression for the rate
constant of second order reaction of the type (A+A
Products)
(or)
14. Explain the action of catalyst promoters and catalyst poisons
using suitable examples
15. Explain BET theory of multilayer adsorption
(or)
16. Write notes on (1) Donnan membrane equilibrium (2)Thixotropy
17. Define the term solubility product? Calculate the solubility
product of Silver chloride at 298K when one litre solution
contains 0.188g of AgCl(Eq.Wt of AgCl = 143.5)
(or)
18. Write the short notes on buffer solutions and explain why does a
solution of weak acid and its salt behave as a buffer.
19. Explain principle involved in potentiometric titration? Discuss
potentiometric titration curves for redox system
(or)
20. Consider the cell,
Zn , Zn2+(0.1) // Fe2+(0.05M) , Fe
Given standard emf of the cell at 298K is0.323V. Write the cell
reaction and calculate emf of cell.