BSc Biochemistry Sem I 2018 19 Dec 2018-19 CHEMISTRY II Question Paper - Mumbai University | munotes

Questions asked in this paper

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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 calculator is allowed
4. Q1 (A) Select the correct option and complete the following statements (Any twelve) 12 marks
5. Q1 The rate law of the reaction A + 2B Product is given by d[Product]/dt = k[A]*.[B]. If A is taken in large excess, the order of the reaction will be il) _ _does not influence the rate of reaction
   • a) Concentration of the reactants
   • b) Temperature of the reactants
   • c) Molecularity of the reactants ili) For a single step reaction A + Products, the
   • iv) _ property increases with rise in temperature
   • v) Unit of Surface tension 1s
   • vi) Plants get water through the roots because of Vil) Fullerene is an allotrope of
   • viii) is called ion 1x) Li combines with nitrogen to
   • a) LiN b) c)
6. Q10 Outer electronic configuration of Group X1) Alkali metals react with water to form hydroxides Oxidation state of sulphur in xiil) Molecule even with one chiral carbon atom can have
   • a) Enantiomers b) diastereomers c) both a and b
   • xiv) The isomer has atleast two similar groups on the same side of the double bond
   • a) Cis b) trans c) Cis and trans XV) _ used to measure optical rotation
   • xvi) A broken wedge in Flying wedge formula indicate the bond plane of paper
   • a) above the b) on the c) below the is present in the meso form of tartaric acid
   • a) Plane of symmetry b) Axis of symmetry c) Botha and b Xviii) Similar physical and chemical properties are observed
   • (B) State whether the following statements are True or False 3
   • i) Molecularity of a reaction is always an integral whole
7. Q11 A molecule on the surface of a liquid is surrounded by other molecules and they are equally attracted in all directions ili) Metallic character increases across the period as we move from left to right
   • iv) Electronegativity of fluorine is more than that of chlorine Nicol prism is used for obtaining plane polarized light
   • vi) X-ray diffraction is employed to find the absolute configuration of a molecule
   • (C) Match the following columns (Any Five) of first order reaction 5
8. Q2 Attempt any Four of the following
   • (A) Derive an expression for the rate constant of a second order reaction of reactants having equal concentration 5
   • (B) meant by order of a reaction? (1)
   • ii) Explain the half life time method for the determination of order — 4
   • (C) A first order reaction takes 20 minutes for 25% 5
9. Q1 rate constant li) taken for 75% of the reaction to be completed
   • (D) i) Define Viscosity of liquid? (1)
   • ii) Explain determination of viscosity by Ostwald’s viscometer? 4
   • (E) At 293K, water formed 30 drops while flowing through the capillary of a Stalagmometer and an organic liquid formed 49 drops. Calculate the surface tension of organic liquid if the densities of water and organic liquid are 0.998 x kg and 0.851 x kg respectively and surface tension of the water 5
   • (F) Define refractive index. How is Abbe’s refractometer used for determining refractive index of any liquid?
10. Q3 Attempt any Four of the following
    • (A) What is inert pair effect? Explain with suitable examples. 5
    • (B) Explain the diagonal relationship between beryllium and 5
    • (C) Illustrate the anomalous behaviour of nitrogen. 5
    • (D) How is calcium carbonate prepared? Explain its important 5
    • (E) How is sodium chloride obtained ? Mention any three of its 5
    • (F) What are carbides ? How are alkali metal carbides prepared? 5
11. Q4 Attempt any Four of the following
    • (A) Explain the terms i) asymmetric carbon and ii) diastereomers 5
    • (B) Assign ‘R’ or ‘S’ descriptors to the following molecules by mentioning priority order of substituents
    • (C) Distinguish between the following: 5
12. Q1 racemic mixture and meso form
    • ii) optical isomerism and geometrical isomerism
    • (D) Discuss the following terms: 5
    • i) chirality
    • (E) i) What is resolution of racemic mixture? 2
    • ii) Assign ‘D’ and ‘L’ nomenclature to the following compounds. 3
    • (F) Discuss conformational analysis of ethane. 5
13. Q5 Attempt any Four of the following
    • (A) Draw a graph of for a first order reaction where ‘a’ is the initial concentration of the reactant and “(a-x)’ is the concentration of the reactant remaining at a particular time 5
    • iii) How is the rate constant determined from each of the graph
    • (B) Define Optically active compound? The density of methyl acetate is kg at 293 K. Its refractive index for sodium D-line is 1.3594. Calculate its molar refractivity (Given : Molecular weight of Methyl acetate = 74) 5
    • (C) Name the oxides of carbon. Write any one source of emission and control measure for each of the oxides of carbon 5
    • (D) Write short note on acid rain. 5
    • (E) Explain optical isomerism of lactic acid. 5
    • (F) Convert the following Fisher projection formulae to Sawhorse 5

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