BSc Chemistry SEM I ATKT 2017-18 ATKT Chemistry Paper II Question Paper - Mumbai University | munotes

Questions asked in this paper

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1. Q1 A] Select the correct option and complete the following sentences : 12 marks
   • i. The rate law of the third order reaction is
   • ii. The units in which molar refraction is expressed as
   • iii. The integrated rate equation for a second order reaction with equal initial concentrations of the two
   • c) K= at (a-x)
   • iv. The formula used in drop number method determination of surface tension of liquid is
   • v. Boron exhibits diagonal relationship with
   • vi. Outer electronic configuration of Group 2 Vii. is not an allotrope of carbon
   • viii. element belongs to Group 13
   • a) b) silicon c) Selenium
   • ix. In flying wedge formula dotted line represents a bond plane of paper
   • a) above the b) behind the c) on the rotatory enantiomer is designated by using symbol
   • Q.P. Code :12152
   • xi. In chiral molecule H3C CHOHCOOH the priority order of atoms will
   • c) > H>OH
   • xii. Absolute configuration can be determined using techniques
   • B] State whether the following statements are true or false. 3
   • i. Forasecond order reaction half life time is inversely proportional to the initial concentration
   • ii. Fluorine is the least electronegative element in Group 17
   • iii. Molecule with plane of symmetry is optically active
   • C] Match the following columns. 5
   • a) isomers
   • iii) ‘7’ number of chiral carbon c) Sodium bicarbonate for first order reaction
2. Q2 A] i) The rate constant for the saponification of ethyl acetate is 0.195 at a initial 4 Calculate the time required for completion of 90% reaction 5 marks
   • ii) Explain Acid catalysed hydrolysis of methyl acetate Asecond order reaction is started with 0.01 mol.dm- concentration of both the reactants. Itis 10% (05) complete in 1600 seconds. Calculate (a) the rate constant (b) the half life time of the reaction 3
   • ii) Explain - Acid catalyzed inversion of a cane sugar (sucrose) as a pseudo unimolecular reaction. 3
3. Q2 B] i) Inastalagamometer method two liquid B formed 40 and 60 drops for fixed volume. If the densities. of A& x 103 kgm? respectively and the surface tension of B is Calculate the surface tension of liquid A 5 marks
   • ii) Explain any three application of liquid crystals. 3
   • B] i). The refractive index of certain compound is 1.4425 and its density is 1.588 x 103 Calculate its molar refractivity. (Molecular weight of the compound is 153) 5
   • ii) Explain the term viscosity and draw a neat, labelled diagram of Ostwald’s viscometer. Explain (a) Specific Refractivity (b) Surface tension (02) 3
   • C]. i) Explain Rate of areaction. 2
   • ii) Explain Molar refractivity. 2
   • Q.P. Code :12152
   • A] (i) Discuss the oxidation states of group 15 elements with respect to inert pair effect. 4
   • (ii) Define metallic character. How does metallic character vary for group 13 elements? Explain the diagonal relationship between Beryllium and Aluminum. (04) 4
   • (ii) Justify the anomalous behavior of Lithium. 4
   • B] (i) carbides? How are the carbides of alkali metals prepared? 4
   • (ii) Name the different types of oxides formed by alkaline earth metals. Describe the preparation of any one type of oxides. (04)
   • B] (i) Formulate the hydroxides of alkali metals and compare their basic strength. 4
   • (ii) What are nitrides? Compare the properties of nitrides of alkali and alkaline earth metals. 4
   • C] Give one methods of preparation and two properties of Sodium carbonate. 4
   • C] Give one method of preparation and two properties of calcium carbonate. 4
4. Q4 A] (i) Explain the term geometric isomerism. Are they enantiomers or diastereoisomers? Give one example each of geometrical isomers in alkene and cyclic system 4 marks
   • (ii) Explain the term racemic mixture with suitable example. Comment on its optical activity. 4
   • A] (i) Define conformations. Draw Newman Projection Formulae representing most stable and less stable conformations of ethane and n-butane 4
   • (ii) Assign D and L nomenclature to following compounds:- 4
   • B] Using suitable examples explain meso isomer. Why is it optically inactive? 4
   • (ii) Convert following structures to Saw-horse projection formula. 4
   • 1) H OH 2) Br H
   • B] suitable example explain the term diastereoisomers. Give the characteristics of How will you represent Erythro and Threo isomers of 3-bromo-2-butanol using Fischer (04) Projection formula? Comment on the advantages of Saw-horse Projection formula 4
   • Q.P. Code :12152 Assign ‘E’ or ‘Z’ descriptor to the following molecules giving priority on the basis of Sequence rule. (04) Assign ‘R’ or ‘S’ descriptors to the following molecules by deciding their priority order on the basis of (04)
5. Q5 Attempt any four of the following : Explain the following methods used in the determination of the order of reaction 5 marks
   • B] (i) Explain - Thermal decomposition of acetaldehyde as a second order reaction. 2
   • (ii)Give the classification of liquid crystals. 3
   • C] Name two oxides of sulfur. Write any two sources and control measures each for oxides of sulfur. 5
   • D] Write note on acid rain 5
   • E] (i) Assign ‘D’ or ‘L’ or ‘trans’ whichever is applicable for following 3
   • (ii)Label the following isomer as per Erythro and Threo notations 2
   • 1) HO H
   • F] Identity chiral and Achiral molecules 2
   • (ii)Explain the terms 3

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