Annamalai University 2008-3rd Year B.Sc Chemistry " 710 PHYSICAL " ( - III ) ( PART - III ) ( ) 5248 - Question Paper
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6. (a) Sketch the phase diagram for H20
system and explain it. (6)
(b) Derive and distinguish between order and molecularity. How the order is determined by t,. method ?
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(c) Derive an expression for Kp interms of partial pressure for gaseous decomposition of N204. Show that for HI equilibrium Kp = Kc.
7. (a) State and explain first and second law of
thermodynamics. (5)
(b) Define H, Cv and Cp. Prove that Cp - Cv = R. One mole of Helium at 27C and latm.pressure undergoes reversible adiabatic expansion until the volume increases by 100 times. Calculate final temperature. (8)
(d) State and explain Carnots theorem. Obtain the relationship between work and heat.
(7)
Name of the Candidate :
5 2 4 8 B.Sc. DEGREE EXAMINATION, 2008
(APPLIED CHEMISTRY)
(THIRD YEAR)
(PART - III)
(PAPER - III)
710. PHYSICAL CHEMISTRY
December ] [ Time : 3 Hours
Maximum : 100 Marks
Answer ONE question from each unit.
All questions carry equal marks.
UNIT -1
1. (a) Discuss the nature of cohessive forces in liquids. (4)
(b) Derive Vander Waals equation and obtain the relationships for Vander Waals constants and inversion temperature. (8)
Turn over
(i) Brownian movement.
(ii) Collision frequency.
(iii) Mean free path. (8)
(OR)
2. (a) Derive Clausis, Berthelot and Dieterici
equation of state. (5)
(b) Derive Maxwells law of distribution of velocities and how it is experimentally verified. (7)
(c) Write notes on :
(i) Troutons rule.
(ii) Viscosity.
(iii) Molar volume. (8)
3. (a) Define and distinguish between
physisorption and chemisorption. (5)
(b) Discuss enzyme catalysis and derive Michaleis-Menton complexes. (7)
(c) State and explain the laws of photochemistry and distinguish between fluorescence and phosphoresecence. (8)
(OR)
4. (a) What are the factors influencing adsorption ?
Discuss adsorption isotherms. (7)
(b) Define the terms catalytic promotors and poisons. Mention the applications of catalysis. (7)
(d) Define quantum efficiency. How is it experimentally determined ? (6)
5. (a) State and explain phase rule and give the
significance of the terms present in it. (6)
(b) Derive the equation for rate constant of first order reaction and deduce t,. from it.
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(7)
(c) State and explain Le Chatelier principle. What are the factors influencing K with temperature ? (7)
(b) Write notes on :
(i) Ostwalds dilution law.
(ii) Kohirauschs law. (8)
(c) Obtain the equation for emf of a concentration cell or an electro chemical cell. (6)
8. (a) Obtain relationship between the volume
and work done in a reversible isothermal expansion. (6)
(b) Discuss Hesss law and derive Kirchoffs equation. (7)
(c) Discuss Joule-Thomson effect. Show that it is iso - enthalpic process. (7)
UNIT - V
9. (a) Define conductance, strong and weak
elecrolytes. Discuss the effect of dilution on conductance. (6)
(b) How conductivity is measured ? Discuss the applications of conductivity. (7)
(c) Derive Nernst equation and give its significance. (7)
(OR)
10. (a) Define ionic activity and activity
co-efficient. Calculate ionic strength of 0-2 M NaCl solution at 27 C. (6)
Turn over
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