BSc Sem I 2017 2018 2018 Chemistry II Question Paper - Mumbai University | munotes

Questions asked in this paper

• Please check whether you have got the right question paper

1. Q2 Answer to the same questions must be written together
2. Q3 Figure to the right indicate full marks
3. Q4 Use of Non-Programmable calculator is allowed Select the correct option and complete the following sentences: (12)
   • i) The units of the role constant of a second order reaction with equal initial concentration of the
   • ii) Units of surface tension is
   • iii) The saponification of ethyl acetate reaction of order
   • iv) With increasing molecular mass of.a liquid, the viscosity ‘
   • a) Increases b) Decreases. No effect
   • v) Among the following can cause global warming
   • vi) Among the following has valence electrons in the third shell
   • viii) Bucky ball fullerene is an allotrope of
   • ix) The group from following have the lowest priority as per sequence rule
   • x) configuration of molecule is determined using technique
   • xi) Among following will exist as optical isomer
   • xii) Racemic mixture rotates plane polarised light in State whether the following statements are true or false: (03)
   • i) Metallic character increases down the group in the periodic table
   • ii) Half life time for a fist order reaction is a constant and independent of the initial concentration
   • iii). Meso isomer is optically inactive
   • Q.P. Code :12153 C Match the following columns: (05)
4. Q2 Ai) A second order reaction with a=b is 30% complete in 80 minutes. Calculate the time taken for 90% completion of the reaction 5 marks
   • ii) Explain =Acid catalysed inversion of a cane sugar (sucrose) as a pseudo unimolecular reaction Ai) Asecond order reaction with equal initial concentration of the reactants is 80% complete in (05) how much amount will be left unreacted at the end of 2hrs 3
   • ii) Explain-Acid catalysed hydrolysis of B i) What is coefficient of viscosity? At 293K, water with a viscosity of 0.0101 poise and density 0.997 gcm? (05) takes 1.9 minutes to flow through a viscometer. Find the time required by an organic liquid to flow through the same viscometer, given its density to be 0.890 & its viscosity to be 0.0062 poise 3
   • ii) Explain the term Molar Refractivity. B i)In a Stalagamometer experiment, the same volume of organic liquid and water formed 40 and 35 drops (05) respectively. It the surface tension of water x 102 Calculate the surface tension of organic liquid. The density of organic liquid is 0.84 x kgm? and that of water is 1.0 x 3
   • ii) What is refractive index?’ Explain the term ‘Molar refraction’. C a) Molecularity of a reaction b) Rate reaction (02) 3
   • ii) Define a) Viscosity b) Liquid crystal Ci) Explain the Order of a reaction (02) 2
   • ii) Define -a) Surface tension b) Specific refractivity 2
5. Q3 Ai) How does beryllium differs from other group 2 elements? 4 marks
   • ii) Write the similarities shown by lithium and magnesium. Ai) Oxygen behaves differently with respect to the other elements in the same group; justify the statement. (04) 4
   • ii) Explain the diagonal relationship between boron and silicon. Bi) calcium oxide prepared? What are its properties? (any two) (04) 4
   • ii) Outline the importance of sodium chloride B i) State any four uses of sodium bicarbonate. (04) 4
   • ii) Write one method of preparation and two properties of calcium carbonate. 4
   • Q.P. Code :12153 C Summarise the characteristics of nitrides of alkali and alkaline earth metals. (04) C What are the different types of oxides formed by alkali metals? Explain each witha suitable example. (04)
6. Q4 Ai) Write a short note on various conformations of n-butane. 4 marks
   • ii) Enlist two pairs of enantiomers from following 4
   • (1) (II) (IV) Ai) Assign ‘R’ or ‘S’ descriptors to the following molecules using sequence rule. (04)
   • ii) Define geometric isomerism. Explain geometric isomerism in olefins and cyclic compounds. B i) Using sequence rule decide priority order of the substituents and assign ‘E’ or ‘Z’ descriptors to following (04) 4
   • a) cl
   • ii) Identify the compound containing chiral carbon from following Bi) Assign ‘D’ or OR ‘cis’ or ‘trans’ notations, whichever applicable to the following compounds:- (04) 4
   • Q.P. Code :12153
   • ii) Convert following Fischer projection formulae to Newman projection formulae 4
   • a) CHO b) CoHs C What is racemic mixture? What is resolution of racemic mixture? (04) the following structures with Erythro and Threo notations (04)
7. Q5 Attempt any four of the following Explain the kinetic characteristics of a first order reaction (05) B i) Explain Integration method of determination of order reaction. (03)
   • ii) Draw a neat labelled diagram of stalagmometer. C Write a note on photo (05) Explain the control techniques used for the emission of oxides of carbon. (05) E between enantiomers and diastereoisomers. (05) F Whatis conformation? Explain conformations of ethane and comment on their relative stabilities. (05) 2

Read from the scan above, so a character or two may differ. The scan is the original.