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
4. Q1 (A) Select the correct option and complete the following statements(Any twelve) 12 marks
5. Q1 pH of the solution containing 4 g of NaOH in 100 of solution (Atomic Wt of NaOH = 40)
   • a) 41 b) 10 c) none of them
6. Q11 The best indicator for titrating HC] with NH,OH is lii) The pH of Human blood Iv) If a portion of the electromagnetic spectrum has a short
   • v) Electromagnetic radiation contains discrete packets of energy
   • a) are isotropic b) possess sharp melting point vil) Number of electrons in valence shell of beryllium in On the basis of VSEPR theory the molecular geometry of
   • ix) The Steric number for water molecule is
7. Q10 The bond angle in x1) A graphical plot of potential vs pH of an aqueous electrochemical system is called as The reducing power of halide ions is in the order
   • a) I>Br b) F>Cl
   • xiii) | Compounds having one or more benzene ring are called XIV) The number of in Cyclopentadiene XV) Pyridine has a six membered ring containing five carbon atoms and one XV1) Nitrobenzene on further nitration the
   • a) o-dinitrobenzene b) m-dinitrobenzene
   • c) p-dinitrobenzene group has electron releasing inductive effect
   • a) b)— CN CHO The bond angle in planar cyclobutane is
   • (B) State whether the following statements are True or False 3
   • i) pH of 0.01 M 2 Space lattice is a random of atoms in space to form a two The number of bond pairs in silicon tetra chloride is three Iv) The number of lone pairs in methane molecule is two Cycloheptatriene is aromatic in nature
   • vi) Transannular strain in present in large ring systems
   • (C) Match the following columns (Any Five). 5
   • (iii) | The titration in (c) which free iodine
   • (iv) | Decrease in (d) | Emits light at a longer group (g) | Emits light at a shorter
8. Q2 Attempt any Four of the following
   • (A) Derive Henderson’s equation for the pH of acidic buffer. 5
   • (B) The pH of solution of ammonia is 10.78. Calculate the 5
   • a) OH
   • b) degree of dissociation
   • (C) Derive the expression for ionic product of water. 5
   • (D) Calculate the frequency in wave number and energy of one photon of radiation whose wavelength is 550nm 5
   • (E) Give differences between crystalline solid and amorphous solid. 5
   • (F) State the law of symmetry. Explain the various axis of symmetry for a cubic crystal 5
9. Q3 Attempt any Four of the following
   • (A) Draw Lewis dot structure of the following 5
   • (B) Define polarizability of an anion. Explain any two factors which favour covalent character of an ionic bond 5
   • (C) Differentiate between ionic and covalent bond. 5
   • (D) Explain the application of VSEPR theory for predicting the shape — 5
   • (E) Balance the following equation with stepwise explanation: 5
   • (F) Explain the reaction involved in the atmospheric oxidation of ferrous ions in aqueous solution 5
10. Q4 Attempt any Four of the following
    • (A) Explain Baeyer strain theory. 5
    • (B) Draw the various conformations of Cyclohexane What is the order of stabilities of various conformations of (2) 3
    • (C) Explain the aromaticity of naphthalene and anthracene. 5
    • (D) What are nitrating agents? State the advantages of using nitrating 5
    • (E) Discuss the concept of antiaromaticity with suitable examples. 5
    • (F) Explain Hammond’s postulate with the help of reaction energy 5
11. Q5 Attempt any Four of the following
    • (A) What is buffer capacity? Calculate the pH of a solution when 200 of 0.2M ammonium hydroxide is mixed with 300 cm’ of 0.15M ammonium chloride. The dissociation constant of ammonium hydroxide is
    • (B) 1). Explain the term electromagnetic spectrum. Determine the Miller indices of the following planes intersecting (3) 2
    • (C) 1) Find the oxidation number of Cr in and 2
    • ii) Write the applications of Latimer diagrams. 3
    • (D) Explain the titration curve for the reaction between KMnQ, and 5
    • (E) Explain the following 5
    • a) Flipping in Cyclohexane
    • b) Pitzer strain
    • (F) Discuss the general characteristics of Aromatic compounds. 5

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