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2 D 92923

Derive Kirchoffs equation showing variation of heat of reaction with temperature.

10 moles of an ideal gas is expanded reversibly and isothermally from pressure 10 atm to 2 atm at
800K. Calculate maximum work done.

Discuss apllications of third law of thermodynamics.
Derive Gibbs-Duem equation.

Identify symmetry elements in (a) BF, (b) ०६56 ; (०) benzene ; (d) acetylene. Name point group of
these molecules.
(5 x 5 = 25 marks)

Section C (Essay)

Answer any one question.
The question carries 11 marks.

(a) What is Joule-Thomson effect ?
(b) Describe Lindes and Claudes method for liquefaction of gases.
(a) State and explain the terms law of mass action and chemical equilibrium.
(b) Apply Lechatelier principle to predict effect of (a) change of temperature (b) change of pressure
on PCl, === PCl, + Cl, 4H = 92.05 KJ.
(1 x 11 = 11 marks)