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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. ii) Acetic acid was shaken with water and ether following concentration in moles per liter were found in two solutions. Conc. in ether 0.03 0.08 0.15 0.27 Conc. in water 0.45 0.86 1.21 1.51 Comment on the molecular condition of acetic acid in both solvents. Q3) a) Attempt any two of the following: [6] i) Explain the positive and negative deviations of a binary liquid system. ii) Derive Nernst distribution law on the basis of thermodynamics. iii) Derive the relation = CRT b) Solve any one of the following: i) [4] Calculate the solubility of CO2 in water at 25 C at a partial pressure of CO2 over the solution of 160mm of Hg. (Given. Henry s law constant K (CO2) = 1.25 x 106 mm Hg). ii) Q4) a) 18.2gm of urea is dissolved in 100gm of water at 50 C. The lowering of vapour pressure produced is 5mm Hg. Calculate molecular weight of Urea. The vapour pressure of water at 50 C is 92mm Hg. Attempt any one of the following: i) Define Helmholtz free energy and Gibbs free energy. Derive the equation DG = 2.303 nRT log10 P2/P . [6] 1 OR Show that depression of freezing point of solution is a colligative property. b) Attempt any one of the following: [4] i) Explain the mutual solubility temperature behaviour of triethylamine - water and nicotine - water systems with suitable diagrams. ii) State and explain the properties of change in Gibb s free energy. Y [3717] - 105 2

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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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