BSc Chemistry SEM II ATKT 2018-19 ATKT Chemistry 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 12 marks
5. Q1 is a Salt of strong electrolytes
   • a) b) Ba(OH)2
   • i) an aqueous medium ili) Electromagnetic radiation propagates in the form of
   • iv) Crystalline
   • a) are isotropic possess sharp melting point c) possess
   • v) The Steric number for water molecule
   • vi). The bond angle in
   • vii). strongest oxidising agent in the electrochemical series
   • a) hydrogen b) c) lithium
   • viii) graphical plot of potential vs pH of an aqueous electrochemical system is diagram
   • a) b) c) Walsh
   • ix) Nitrobenzene on further nitration gives_ __as the
   • a) b) m-dinitrobenzene c) p
   • x) number of pi electrons in cycloheptatriene is
   • xi) distance between the flagpole atoms in the boat form of
   • Q.P. Code: 51643 xil) The ____ bonds in chair form of cyclohexane are parallel to the axis of symmetry
   • (B) State whether the following statements are False 3
   • i) The pH is a qualitative measure of the acidity or basicity of a
   • ii) The process of reducing the sulphide ores into more reducible oxide is known as roasting ui) Chlorine atom has strong withdrawing inductive effect
   • (C) Match the following columns ii | Delayed emission of pyridine iii | The normal pH | o-p directing group of natural water is 5
6. Q2 (A) G) Calculate [H30*] and pH of a0.2M solution of HCN 5 marks
   • (ii) Explain the concept of ionic product of water. 3
   • (A) Define the term ‘degree of are the factors that affects the degree of ionization? of is present in of a solution. Calculate the 5
   • Q.P. Code: 51643
   • (B) (i) Calculate the a) frequency in wavenumber 5
   • b) energy of one photon of radiation
   • (ii) Give three differences between crystalline solid and amorphous 3
   • (B) (i) State the law of symmetry. Explain the various axis of symmetry for a cubic crystal 5
   • (ii) Give three characteristics of electromagnetic radiation. 3
   • (C) a) Triprotic acid 2
   • b) pOH Gi) Define a) Unit cell (2)
   • b) lattice plane
   • (C) (i) Define a) Diprotic acid 2
   • b) Buffer action
   • (ii) Scattering of radiation 2
   • b) Spectroscopy
7. Q3 (A) G) Define polarizability of an anion. Explain any two factors which favour covalent character of an ionic bond 5 marks
   • (ii) . Draw Lewis dot structure of the following. 3
   • (A) What is VSEPR theory? Describe the basic ides of VSEPR theory given by Gillespie and Nyholm 5
   • (ii) . Explain the following with suitable examples. 3
   • (B) Balance the following equation with stepwise explanation using 5
   • (ii) Give the applications of Latimer diagram. 3
   • Q.P. Code: 51643
   • (B) (i) the chemical equation for the redox reaction between Ce* and Fe**. Calculate the the titration of 10.0 cm of 0.1 M Fe** solution with of 0.1M standard solution of Ce** in the presence of dilute sulphuric acid at 298K 5
   • (ii) Write all the disproportionation reaction of Cu * 3
   • (C) G) Explain the application of VSEPR theory for predicting the shape and F F bond angle in No of Cl =17] 4
   • (C) Explain the application of VSEPR theory for predicting the shape and F bond angle in XeF, [At No of Xe=54] 4
8. Q4 (A) Draw the chair and boat forms of cyclohexane and explain their 5 marks
   • (ii) the concept of flipping of cyclohexane. 3
   • (A) Explain with suitable examples Baeyer Strain theory. 5
   • (ii) Draw the resonating structures of Naphthalene and Anthracene. 3
   • (B) (i) Discuss the characteristic properties of aromatic compounds. 5
   • (ii) Complete the following reactions. 3
   • a) + anhydrous ?
   • (B) Give the general mechanism of aromatic electrophilic 5
   • (ii), Explain the Van der Waals strain in cycloalkanes. 3
   • Q.P. Code: 51643
   • (C) G) Hammond’s postulates. 4
   • (C) (i) Classify the following groups as ortho-para directing or. — 4
9. Q5 Attempt any Four of the following
   • (A) Derive Henderson’s equation for the pOH of basic buffer. 5
   • (B) a) Explain the term electromagnetic spectrum. 2
   • b) Determine the Miller indices of the following planes 3
   • (C) Find out the oxidation number of Cr in the following. 5
   • (D) Explain the role of as an oxidizing agent with suitable 5
   • (E) What is Friedel Crafts alkylation reaction? Explain its 5
   • (F) Explain activated aromatic rings in electrophilic substitution 5

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