Chemistry Paper IX Physical Chemistry Previous Year Question Paper Year 2006 : IIIrd Year

Q. 1. The distribution constant ofa certain solid ‘X’ between two immiscible solvents A and B is 10 at 25°C. If the solubility of the solid in solvent A is 4.8 mol lit-1, what is its solubility in solvent B ?

(b) 75% of a reaction of the first order was completed in 32 minutes. When was it half completed ?

(c ) The emf of the cell setup as under was found to be 0.1182 volt at 25°C. Calculate the solubility of AgCI.
Ag|Saturated solution of AgCI || AgNO3 (0.01N) | Ag

(d) Calculate the energy of a photon corresponding to a wavelength 360 nm.
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Q. 2. What is a unimolecular reaction ? Distinguish between order of a reaction and its molecularity. Derive an expression for rate constant of a reaction of the type :
A + A————> Product
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Q. 3. Define ‘phase’, ‘number of components’ and degrees of freedom for a system. Derive the relationshop P = C – F + 2.
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Q. 4. What is the difference between electrode potential and standard electrode potential ? How is the emf of a cell measured? How would you calculate AG, AH and AS from emf measurement?
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Q. 5. What are photo physical and photochemical processes? Derive Lambert-Beer’s law. What are its limitations ?
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Q. 6. Write short notes on any two of the following :
(a) Half-life period;
(b) Concentration cells;
(c ) Nernst distribution law.
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