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

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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 long table/non-programmable calculator is allowed
4. Q1 A Select the correct option and complete the following statements 12 marks
   • i) is a weak electrolyte
   • a) Nitric Acid
   • b) Sodium Hydroxide
   • c) Acetic Acid
   • ii) At 298 K, pH + pOH =
   • iii) are the highest energy and lowest wavelength radiations
   • b) UV radiations
   • iv) The geometrical form consisting of a regular arrangement of a constituent particles of a crystalline solid in three dimensional space is called
   • a) Unit cell
   • b) Space Lattice
   • c) Lattice planes
   • v) A polar covalent bond is formed when the bonding pair of electrons in a molecule is
   • a) Shared equally by both the atoms
   • b) Not shared equally by both the atoms
   • c) Transferred from one atom to the other atom
   • vi) Polarisabililty of an anion )
   • a) -Increases with decrease in size
   • b) Increases with increase in size
   • c). Decreases with increase in charge
   • vii) Strongest oxidizing agent in the electrochemical series is
   • viii) The which free iodine solution is used is called titration
   • a) Axial bonds are not changed to equatorial Axial bonds are changed to equatorial
   • c) Equatorial bonds are not changed to axial
   • Q.P. Code :03737
   • b) pyridine
   • c) CISO3H in
   • xi) Which of the following compounds is anti- aromatic?
   • a) Cyclopropenyl anion
   • b) Cyclopropenyl cation
   • c) Tropylium cation
   • xii) is stong electon withdrawing group B State whether the following statements are True or False: 3
   • i) Acrystal can have more than one centre of symmetry
   • ii) At room temperature, is freely soluble in water
   • iii) During halogenations of aromatic hydrocarbons, is the halogen carrier C Match the following columns: 5
   • i) Fluorescence i) delayed emission of low energy
   • ii) Rubber ii) instantaneous emission of low
   • iii) H-O-H bond angle in iii)
   • iv) H-N-H bond angle in NH3 iv) Amorphous solid
   • v) Chair form vi)
5. Q2 A i) Explain the factors that affect the degree of ionization of any weak electrolyte 5 marks
   • ii) Calculate the pH of Acetic acid if it is 2.5% ionized. 3 A i) At 298 K, calculate the pH of 5
   • ii) Explain with suitable examples “Common lon Effect” B i) Calculate the wavelength, wave number and energy associated with radiation of 5 State and explain the law of constancy of interfacial angles. 3 B i) — Find Miller indices of the planes whose intercepts on crystallographic axes are 5
   • ii). note on electronic transition. 3
   • Q.P. Code :03737 Ci) Define: a) Buffer capacity Buffer action 02
   • ii) Define Spectroscopy Wavelength radiation 02 Ci) Define : a) Degree of ionization b) Polyprotic acid 02
   • ii) Define : a) Plane of symmetry b) Lattice planes 02 A i) Explain ionic bond and coordinate bond with suitable examples. 04
   • ii) Write a comprehensive note on Fajan’s rules, 04 A i) Draw the Lewis dot structure for the following molecules: 04
   • ii) Explain isoelectronic principle with suitable examples. 04 B i) Balance the following equation with stepwise explanation: 04
   • ii) The standard electrode potential values of copper for the following redox reactions are 04 Construct Latimer diagram and find out the values for the reaction : B i) Explain how copper is extracted ore by auto reduction process. 04
   • ii) Calculate the for the titration between 0.1M Ce(IV) and 5cm? of 0.1M Fe(II) after 04 addition of (i) 2.0 5.0 cm? and (iii) 6.0 cm? of 0.1M Ce(IV) Explain the application of VSEPR theory for predicting shape and F-S-F bond angles in 04 C the application of VSEPR theory for predicting shape and F-Br-F bond angles in BrFs [Atomic 04 number of Br =35]
6. Q4 i) Explain the following strains in cycloalkanes — van der Waals strain, Torsional strain. 5 marks
   • ii) State and explain rule with examples. 03
   • Q.P. Code :03737 A_ i) Draw the various conformers of cyclohexane and their potential energy diagram. 05
   • ii) Explain aromaticity of pyrrole. 03 What are activated aromatic rings for electrophilic substitution reaction? Give examples with 04
   • ii) Explain with a suitable example the concept antiaromaticity. 04 Draw and explain the energy profile diagram for aromatic electrophilic subsituation reaction. 04
   • ii) Explain Hammond’s Postulate. 04 C_ i) Write an equation for the nitration of nitrobenzene. 02
   • ii) Write an equation for acylation of benzene. Name the electrophile formed in the reaction. 02 C Complete the reactions. Name the products. 02
   • ii) 02
7. Q5 Attempt any four of the following: Derive Henderson’s equation for the pH acid buffer. 05 Explain the following phenomenon that occurs when electromagnetic radiation interacts with matter: 05
   • C. Explain Lone pair - Lone pair repulsion is maximum than the repulsion of lone pair- bond pair and bond pair pair of electrons. 05 D the oxidation number of Phosphorus in PH3, P20s, POCI3 and PCls. 05
   • E. What is aromaticity? Which of the following molecules or ionic species are aromatic? Cyclopentadiene 05 and cyclopentadienyl anion. Justify your answer Give the sulphonation of benzene. 05

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