BSc Biochemistry Sem II ATKT 2018-19 ATKT FYBIO CHEM Chemistry I Question Paper - Mumbai University | munotes

Questions asked in this paper

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1. Q2 Answer to the same question must be written together
2. Q3 Figure to the right indicate full marks
3. Q4 Use of logtable/non-programmable calculator is allowed
4. Q1 A. Select the correct option and complete the following sentences. 12 marks
5. Q1 Foran ideal gas, compressibility factor is
   • a) less than one greater than one c) equal to one
   • ii) The unit of Van der Waals is
   • iii) A reaction at equilibrium, has
   • a) the rates of forward and backward reaction is equal
   • b) the rate constant of forward and backward reaction is unequal
   • c) the concentration of reactant is grater than the concentration of products
   • iv) When gases are mixed together changes
   • v) is the acidic gas
   • a) Ho b) c) HCl
   • vi) The formula for silver sulphate is
   • vii) In the following reaction which species act as a base? vili) Acidic and basic proportion of non metallic and metallic oxides can be explained by
   • ix) has lesser reactivity therefore it has better selectivity
   • x) Propyne is prepared from on treatment with sodamide
   • c) both aandb x1) Oxymercuration-Demercuration of an alkene is
   • c) Markonwnikoff addition is an allylic and benzylic brominating agent
   • Q.P. Code : 31846
   • B) State whether the following statements are true or false 03
   • i) Non ideal gas obeys the ideal gas equation only at low pressure and high temperature
   • ii) Higher pH is required to start the precipitation of hydroxides Birch reduction of 2—Butyne gives cis-2-Butene
   • C) Match the following columns: 05 law m) Preparation of higher Alkane P n) Va y (at constant P)
   • r) Preparation of alkyl halide
   • s) Unstable
6. Q2 A) i) Discuss the Van der Waals modification of the ideal gas equation PV =nRT by replacing the pressure with corrected pressure 5 marks
   • ii) Calculate the compressibility factor for the gas at 298K if 5 moles of it occupy at 03 a pressure of 1.013 x Nm? (R = 8.314
   • A) 1) Write a note on Maxwell-Boltzmann’s distribution of velocities. 05 li) State and explain Charle’s law. 03
   • B) 1) Define heterogeneous reaction. 05 The amount of H2, b, and HI are 0.2 and 45.8g respectively, in the reaction If the volume is 1 L, calculate equilibrium constant for the reaction with examples reversible and irreversible reactions. 03
   • B) 1) The free energy change for a reaction at 275 K is -65KJ. The enthalpy change is—50KJ. 05 Calculate entropy change of a reaction. What will be the free energy change at 300 K?
   • ii). Explain Le-Chatelier principle with respect to change in temperature and pressure in the 03 formation of gaseous ammonia from Nitrogen gas and Hydrogen gas
   • C) Write any four assumptions of kinetic theory of gases. 04
   • C) State any four characteristics of chemical equilibrium. 04
7. Q3 A) Discuss the effect of uncommon ion with examples in qualitative analysis. 5 marks
   • ii) The solubility product of AgBr is 3.3 x at C. What is the concentration of 03 ion reauired to precipitate AgBr from 0.01 M AgNOs solution?
   • Q.P. Code : 31846
   • A) 1) Explain identification of evolution of sulphur dioxide with balanced chemical reaction. 05
   • ii) Describe the role of oxine paper in qualitative analysis. 03
   • B) Explain the concept of acid base theory in understanding Friedel-Craft acylation 05
   • ii) Explain Lowry-Bronsted Acid-base concept with suitable example. 03
   • B) i) Explain Arrhenius acid-base concept. Give any two applications and limitations of the 05
   • ii) What is conjugate acid-base? Label the conjugate acid-base in the following reactions. 03
   • C) What are dry tests & wet tests? Explain. 04
   • C) What is equivalence point? Calculate pH of solution in the vicinity of equivalence point 04 when 10.9 cm? of 0.1 M NaOH is added to 10.0cm? of 0.1. M HCI
8. Q4 A) i) Explain mechanism with a suitable example. 5 marks
   • ii) Give the reactions for the ozonolysis of propene 03
   • A) 1) regioselective reaction. Write a short note on Hoffmann elimination. 05
   • ii) Complete the following reactions and name the reactions: 03
   • B) 1). Give stepwise reactions for the chlorination of methane. What type of mechanism do the 05
   • ii). What is an acetylide? How is it prepared? 03
9. Q1 Give reactions for the dehydration of primary, secondary and tertiary alcohols. Suggest one more dehydrating agent that can be used 5 marks
   • ii) is an elimination reaction? Give one example of a - elimination reaction. 03
   • Q.P. Code : 31846
   • C) Give the mechanism for the bromination of toluene using NBS. 04
   • C) Write step wise reactions for hydroboration oxidation of ethene. Is ita Markownikoff or 04
10. Q5 Attempt any four of the following
    • A) Show that Joule Thomson effect is an isoenthalpic process. 05
    • B) Explain the physical significance of free energy. 05
    • C) How will you identify following evolved gases? 05
11. Q1 Oxygen gas
    • D) Explain Pearsons’ principle of acid base. On the basis of it comment on stability ofz 05
    • E) Complete the following reactions & identify the major products. 05 State and explain the rule governing the above addition reaction
    • F) List the factors that favour reactions. 05

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