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Pune University - SY BSc (Sem - I) CHEMISTRY, April 2010

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Total No. of Questions : 4] P262 [Total No. of Pages : 2 [3717] - 105 S.Y. B.Sc. CHEMISTRY CH - 211 : Physical Chemistry (New) (Sem. - I) (21311) (Theory) Time : 2 Hours] Instructions to the candidates : 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Use of logarithmic table and calculator is allowed. 4) Neat diagrams must be drawn wherever necessary. [Max. Marks : 40 Q1) Answer the following: a) State the third law of thermodynamics. b) Give the equation to calculate amount of substance extracted. [10] c) d) e) f) g) Define the term molar heat of vaporisation. State Le - Chatlier - Braun principle. State Raoult s law of partial vapour pressure. What is the Van t Hoff s factor? Draw a labelled diagram of apparatus used in Landsberger s method. h) i) j) Define the term isotonic solutions. Give applications of Henry s law. Define vapour pressure of a liquid. Q2) a) Attempt any two of the following: b) [6] i) Derive the expression for entropy change on mixing of ideal gases. ii) What are KC and KP? Derive the relation between them. iii) Describe the construction and working of modern osmometer. Solve any one of the following: [4] i) At 372.6K and 376.6K the vapour pressure of water are 0.982 atm and 1.018 atm respectively. What is the heat of vapourization of water. [R = 8.314 J mole 1 k 1]. P.T.O.

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Additional Info : S.Y. B.Sc. Chemistry (Semister - I), CH - 211 : Physical Chemistry (Theory) (New Course), Pune University
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