BSc Chemistry SEM II 2018 19 May 2018-19 CHEMISTRY PAPER I Question Paper - Mumbai University | munotes

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1. Q2 Answers to the same questions must be written together
2. Q3 Figures to the right indicate full marks
3. Q4 The use of log table/non-programmable calculators is allowed
4. Q1 A. Select the correct option and complete the following sentences 12 marks
5. Q1 The velocity for which the fraction of molecule is maximum is called
   • c) minimum velocity
   • ii) The compressibility factor which is the deviation of real gas from ideal behaviour is given by the equation Gibbs free energy is
   • a) path function b) state function c) constitutive property
   • iv) The van-der Waal’s constant ‘a’ is expressed inthe
   • v) which follows all assumptions of kinetic theory of gases is
   • vi) temperature and pressure the criterion for spontaneity is
   • vii) When is added to the solution of Cl ion which gives white gas is in colour
   • ix) Chlorine gas is in colour
   • x) Molecule or ion can behave both as Bronsted acid and base are x1) According to Lewis concept an base is
   • xii) The conjugated acid of NH3
   • xiii) Lesser the reactivity of a reagent, _ is its selectivity
   • xiv) Wurtz reaction between 2 molecules of the same alkyl halide gives
   • a) symmetrical alkane with even number of carbon atoms
   • b) unsymmetrical alkane with even number of carbon atoms
   • c) symmetrical alkane with odd number of carbon atoms
   • xv) Formation of ozonoide from alkene is a reaction
   • xvi) The product of oxymercuration-demercuration of an alkene is a 1-propanol can be dehydrated using
   • a) conc at b) 60% at Formation of 1-bromopropane from propene by addition of HBr is in
   • B. State whether the following statements are true or false (any three): 3
6. Q1 The distance travelled by the molecule before collision is called free The value of equilibrium constant of a reaction depends on presence of
   • iv) The end point acid base depends on pH
   • v) Dehydrohalogenation of ethyl bromide follows E, mechanism
   • vi). The ease of dehydration of alcohols is > >
   • C. Match the following columns (any five): 5
   • ii) Hydroxylation of alkenes with OsO, state function
   • g) conjugated diene
   • h) alkane Answer any four of the following:
   • A. Explain the terms compressibility factor and inversion temperature. 5
   • B. Derive Van-der Waal’s equation for pressure correction. 5
   • C. Calculate the value of standard free energy change and equilibrium 5 constant for the following reaction at 298K Given: = 97.8 and = 51.3 kJ
   • D. Give the thermodynamic derivation of the equilibrium constant. 5
   • E. Using ideal gas equation and Van-der Waal’s equation, calculate the 5 pressure exerted by 11.0 g of CO, occupied in 1.5dm’ at 298K molar mass of CO>= 44
   • F. State Le-Chatelier principle. How does it explain the effect of change 5 of variables on the equilibrium?
7. Q3 Answer any four of the following:
   • A. Explain addition of buffer in the separation of and Ba 5
   • B. Name the various types of qualitative analysis. 5
   • C. Write a note on common ion effect. 5 Write a note on HSAB concept. 5 classification of substances of acids and bases of solvent 5
8. Q4 Answer any four of the following:
   • A. Write stepwise reactions for the preparation of carbon tetrachloride 5 from methane. How would you separate the commercially important products from the product mixture?
   • B. What does E;cB stand for? Explain giving reasons which of the 5 following substrates will preferably undergo mechanism:
   • C. State and explain Saytzeff’s rule with respect to dehydrohalogenation 5 of 2-bromobutane. Why is the reaction called regioselective?
   • D. Give stepwise reactions for the following: 5
   • i. Ozonolysis of propene il. Hydroxylation of propene via epoxidation
   • E. Explain the following: 5
   • i. Tertiary butyl chloride prefers to undergo dehydrohalogenation
   • ii. Hydration of higher alkynes gives only ketones and not
   • F. How would you prepare the following: 5
   • i. propyne from acetylene il. propyne from ,2-dibromopropane
9. Q5 Answer any four of the following:
   • A. Calculate the equilibrium constant for the reaction at 298K 5 The standard molar enthalpy and entropy of the reaction are -55.8
   • B. Write short note on Joule-Thomson effect. 5
   • C. The solubility product of magnesium hydroxide 1.4 at 298 K. 5 Calculate it’s solubility in mol. Given [Mg=24.32, O=16, H=1)
   • D. Give the advantages and limitations of Lowry-Bronsted concept. 5
   • E. Write the reaction for the action of N-bromosuccinimide on methyl 5 benzene. Explain the mechanism of the reaction
   • F. Give reactions for the following: Action of alcoholic KOH on 2-bromo butane 1 li. Stepwise addition of HCI to acetylene 2
   • ii. Action of on 2-propanol 2

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