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Pune University - FY BSc CHEMISTRY - I, April 2010

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Total No. of Questions : 5] [Total No. of Pages : 3 [3717] - 5 P183 F.Y. B.Sc. CHEMISTRY - I Physical & Inorganic Chemistry (Theory) (Paper - I) (New Course) (2008 Pattern) Time : 3 Hours] Instructions to the candidates : 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Draw neat diagrams wherever necessary. 4) Use of logarithmic table / calculator is allowed. [Max. Marks : 80 Q1) Attempt the following : [16] a) Calculate the hydroxyl ion concentration if POH of the solution is 2.54. b) State and explain the units of Vander Waal s constants a and b . c) What are the micells? Give two examples. d) Give characteristics of enzyme catalysis. e) State and explain second law of thermodynamics on the basis of entropy. f) Convert 0.82 moles of NaOH in gms. (At. wt. of Na = 23, O = 16, H = 1). g) Define Hydrogen bond . h) Define metallic bond and covalent bond. Q2) a) Attempt any four of the following : [8] 6.321 i) Find the value of P if loge = P. ii) State any four rules of logarithm. iii) Find the equation of a line that is parallel to 3y = 6x + 8 and which passes through the point (4, 3). iv) If the equation of line is y = 3x 5. Find the slope and intercept. v) If y = eax find dy/dx. x find dy/dx. 1 x vi) If y = vii) (4 x 3 + 7 x 2 + 3) dx = ? 2 viii) 4x 3 dx = ? 1 P.T.O. b) What is vapour pressure of liquid? Describe any one method for measurement of vapour pressure. [4] c) Attempt any one of the following : [4] i) ii) Q3) a) The vapour pressure of water at 293 K and 313 K are 2.34 x 103 Nm 2 and 7.38 x 103 Nm 2 respectively. Calculate the heat of vapourization of water. (Given : R = 8.314 J mole 1 K 1). A heat engine operates between 0oC and 100oC. It absorbs 45.36 Kcal of heat from the source. Calculate the maximum work done by the engine. (Given 1 cal = 4.184 J). Attempt any three of the following : [12] i) Write a note on Ritz combination principle and explain hydrogen spectrum. ii) Explain spontaneous and nonspontaneous process with the help of suitable examples. iii) What is compressibility factor? Discuss the variation of it with pressure of gases. iv) Explain the general characteristics of catalytic reaction. b) Attempt any one of the following : [4] i) Calculate the frequency and wave number associated with the radiation of wavelength 750 nm and 300 nm. ii) Calculate the energy of the electron in the second orbit of hydrogen atom. (Given : h = 6.626 x 10 34 Joule.sec.me = 9.109 x 10 31 kg e2 = 2.307 10 28 Nm2). 4 0 Q4) a) Attempt any three of the following : [12] i) What is a colloid? Distinguish between Lyophilic and lyophobic colloids. ii) How does the concept of activation energy explain the role of catalysis? iii) Explain various properties of gels. iv) Explain the assumptions of Bohr s theory and give its limitations. [3717] -5 2 v) b) Describe Millikan s method for determination of charge on the electron. Attempt any one of the following : [4] i) ii) Q5) a) Explain, effect of hydrogen bonding on properties of compounds. What is Hybridisation? Give its hypothetical sequence of steps involved in the formation of hybrid orbital? Attempt any two of the following : [6] i) Discuss the statement No proper place can be assigned to hydrogen in the periodic table . ii) How will you prepare 1) 300 ml 0.5N NaCl soln. 2) 700 ml 0.2M, Na2SO4 soln. (At. wt. of Na = 23, Cl = 35.5, S = 32, O = 16) iii) Define Overlap and explain which factor affect the extent of overlap of atomic orbital. b) Attempt any two of the following [10] i) State the postulates of Pauling-Slater theory. ii) Explain the bonding and shape of H2O and H2S molecules on the basis of VSEPR theory. iii) When 3.19 gm of sulphur vapourised at 450oC and 723 mm pressure, the vapour occupies a volume of 780 ml. What is molecular weight of sulphur vapour under these condition. If atomic weight of sulphur is 32, what is the molecular formula of sulphur vapour under these condition. [3717] -5 3

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Additional Info : F.Y.B.Sc. CHEMISTRY - I : Physical & Inorganic Chemistry (Theory) (Paper - I) (New Course) (2008 Pattern), Pune University
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