BSc Chemistry SEM II 2016 17 2016-17 Chemistry Paper I Question Paper - Mumbai University | munotes

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1. Q2 Answer 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 calculator is allowed
4. Q1 A. Select the correct option (MCQ) and complete the following sentences. 12 marks
   • i. According to Charle's law, at constant pressure, the volume of fixed mass of an ideal gas is
   • a) Equal to its temperature
   • b) Directly proportional to its absolute temperature
   • c) Inversely proportional to its temperature
   • ii. During Joule-Thomson effect, the enthalpy of an system
   • a) Remains constant
   • b) Increases
   • c) decreases
   • iii. The unit of entropy is
   • iv. When the number of moles of gaseous reactants is equal to the number of moles of gaseous products formed then
   • v. When zinc is heated with dilute sulphuric acid it evolves gas
   • c) No
   • vi. Sample required for micro qualitative analysis is about
   • b) 0.05g to 0.1g 0.5g to 1.0g
   • vii. among the following is a Lewis base
   • viii. Methyl orange shows distinct colour change at the pH range of
   • a). 3.1 to 4.4
   • b) 8.3 to 9.0
   • ix. Alkenes give addition reaction with
   • a)~ Only Br2
   • c) Both (a) and.(b)
   • b)~ Substitution
   • c) Elimination
   • Q.P. Code :03729
   • xi. Reaction intermediate in addition of HBr to alkene is
   • a) Free radical
   • xii. Conversion of alkene to alkane involves reaction
   • a) Addition
   • b) Elimination
   • c) Substitution
   • B. State whether the following statements are True or False : 03
   • i. The average velocity is the arithmetic mean of the various velocities of the molecule
   • ii. S?is an example of Bronsted base
   • iii. lodination of alkanes is reversible
   • C. Match the following : 05
   • ii. | Unit for molar entropy One step reaction
   • iv.| SO2 p
   • v. | E1 reaction. q
5. Q2 A. i. Explain the causes of the deviation of gases from an ideal behavior. 5 marks
   • ii. Explain the term Inversion Temperature. 03
   • A. i. Discuss Vander Waal's modification of the ideal gas equation PV = nRT by replacing pressure with 05 correction due to, intermolecular force of attraction
   • ii. State Boyle's law, Charle's law and Avogadro's law. 03
   • B. i. an expression for equilibrium constant thermodynamically. 05
   • ii. For the equilibrium, S it was found that at 298K and at equilibrium, was 18% 03 dissociated. Calculate the equilibrium constant (Kp) under atmospheric pressure condition and at the
   • B. -Explain the spontaneity of a chemical reaction and physical significance of free energy. 05 The free energy change reaction at 350K is -63kJ, the enthalpy change is -38kJ. Calculate the 03 entropy change of the reaction 5 dm? flask at 300K
   • C. i. State and explain the law of mass action. 02
   • ii. Define: 02
   • a) Equilibrium constant
   • b) Heterogeneous reaction
   • Q.P. Code :03729
6. Q3 A. i. Explain diverse ion effect. 5 marks
   • ii. concentration of NaBr required to precipitate AgBr from 0.01M AgNO; solution if its 03 solubility product is at
   • A. i. basis of the weight of the sample for analysis, explain the types of qualitative analysis. 05
   • ii. Explain the importance of solubility product. 03
   • B. i. Explain the Arrhenius concept of acids and bases. Give any two applications and two limitations of — 05
   • ii. What is equivalence point? Calculate pH of the solution in the vicinity of equivalence point when 9.9 03 cm? of 0.1M NaOH is added to 10.0 cm? of 0.1M HCI
   • B. i. Explain 'Pearson's principle’ of acids and bases. On the basis of this, comment on the stabilities of 05
   • ii. Explain the terms acid and base on the basis of auto-ionisation of H20. 03
   • C. What is complexation phenomenon? Explain its use in the separation of and Fe**. 04
   • C. What is conjugate acid base pairs? Label the conjugate acid base pairs in the following reactions. 04
   • a) HI+H,0 =H30* +
7. Q4 A. i. Explain ozonolysis of alkenes with a suitable example and its use in synthetic chemistry. 5 marks
   • ii. How is acetylene converted into the following compounds? 03
   • a) Vinyl chloride
   • A. i. Explain oxymercuration-demercuration with a suitable example. 05
   • ii. What are the advantages of Wilkinson's catalyst in the hydrogenation of olefins? 03
   • B. i. the mechanism involved in.allylic bromination using NBS. 05 Explain Wurtz-Fittig reaction with examples. 03
   • B. i. the mechanism involved of Markownikoff's addition. 05
   • ii. one method for preparation of a) Propane b) Ethyne. 03
   • C. State and.explain Hofmann rule with an example. 04
   • C. Complete the following reactions : 04
   • i. 2-Butyne catalyst ?
   • Q.P. Code :03729
8. Q5 Attempt any four of the following :
   • A. Explain the compressibility factor and calculate the compressibility factor for the gas if 5 mol of it 05 occupy 10 dm? at 300K and at pressure of
   • B. State the Le-chatelier's principle and discuss its application. 05
   • C. Explain the importance of reagent papers in qualitative analysis. Give the preparation and use of lead
   • D. Explain the factors influencing the strengths of Lewis acids and bases. 05
   • E. Explain the meaning of reactivity and selectivity by taking example of chlorination and bromination
   • F. How does ethyne react with the following reagent?
   • d) 20% H2SO,and 1% HgSO
   • e) Na

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