BSc Chemistry SEM II 2018 19 May 2018-19 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 log table/ non programmable calculator is allowed
   • (A) Select the correct option and complete the following statements(Any twelve) 12
4. Q1 The pH of il) is an example of basic buffer ili) The pH of 0.001 M HClis
   • v) Repeatable entity of a crystal structure is known as
   • b) substances with definite melting points
   • C) possess anisotropy Vil) The number of bond pairs in silicon tetrachloride molecule Number of electrons in valence shell of carbon in methane 1x) The Steric number for CO, molecule is
5. Q10 The bond angle in A graphical plot of potential vs pH of an electrochemical Indicator used in the titration involving the use of Iodine
   • xiii) The bond angle in planar cyclohexane is is used as a catalyst in halogenation of benzene
   • xvi) Anthracene has __ _pi electrons
   • xvii) |Phenanthrene is Electron withdrawing groups have on aromatic ring in electrophilic substitution
   • a) activating
   • (B) State whether the following statements are True or False 3
   • i) In an infinitely dilute solution, a weak electrolyte is il) The energy of visible light is lesser than the infrared rays ili) CIF; is T-shaped molecule
   • iv) The number of lone pairs in molecule is one
   • v) Cyclopentadiene is Antiaromatic
   • vi) The energy of transition state is higher than that of
   • (C) Match the following columns(Any Five) Elements of (b) | reduction 5
   • (vi) | Flipping of Attempt any Four of the following
   • (A) Explain the use of Henderson equation for the measurement of pH of a basic buffer solution?
   • (B) A buffer solution of pH 4.5 is to be prepared by using acetic acid and sodium acetate. Calculate the ratio of [salt]: [acid] that must be used.[Given: Ka = 1.8 5
   • (C) Define the term Degree of ionization.What are the factors which affect the degree of ionization? 5
   • (D) The lowest frequency of electromagnetic radiation used for communication purposes is at 76 Hz. Calculate the 5
   • b) frequency in and
   • c) energy of the electromagnetic radiation
   • (E) Define crystallography and interfacial angle. Explain the law of constancy of interfacial angles 5
   • (F) What are the seven crystal systems? Give the unit parameters (length and angels) of any three-crystal system Attempt any Four of the following 5
   • (A) Define the following terms:- 5
   • (B) Draw Lewis dot structures for the following molecule/ions. 5
   • (C) Explain isoelectronic principle.Give any two of its applications. 5
   • (D) Give a brief account of Sidwick-Powell theory.On the basis of this theory predict the shape of the following molecules 5
   • (E) Balance the following redox reaction with stepwise ( in acidic medium) 5
   • (F) i) Calculate the E system for titration of 10.0cm* of 0.1M Fe** with a standard solution of in presence of 0.1 M Sulphuric acid, on addition of 5
   • a) and b) 11.0 cm’ of 0.1M solution at 298 K Explain Nitration of Benzene with mechanism ? (3)
   • (B) Explain Huckel’s Rule of aromaticity? Discuss aromaticity of napthalene and anthracene
   • (C) i) Which of the following has substituent on axial bonds? 3
   • ii) Explain antiaromaticity with suitable examples? 2
   • (D) State Hammond’s Postulate. Explain how it is possible to identify the structure of Transition States 5
   • (E) Explain Steric strain and Pitzer strain ? 5
   • (F) What are activated aromatic rings and deactivated aromatic 5
6. Q5 Attempt any Four of the following
   • (A) Derive the expression for ionic product of water. 5
   • (B) Define wavelength and frequency. Give three characteristics of 5
   • (C) Find out the oxidation number of S in and 2
   • ii) are disproportionation reactions? Explain the disproportionation reaction of Cu* to and Cu’ 3
   • (D) Explain Frost diagram for manganese ion in various oxidation 5
   • (E) Draw the chair conformation and boat conformation of cyclohexane. Explain the structures of chair conformations and 5
   • (F) Which of the following are aromatic, antiaromatic or non 5

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