Download OU B.Sc 2018 May-June 2nd Year 2nd Semester 7109 Chemistry Question Paper

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Code No. 7109 / E

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FACULTY OF SCIENCE

B.Sc. IV-Semester (CBCS) Examination, May / June 2018

Subject : Chemistry

Paper - IV

Time : 3 Hours

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Max. Marks: 80

SECTION - A (5 x 4 = 20 Marks)

(Short Answer Type)

Note : Answer any FIVE of the following questions.

1. Write the names of the following coordination compounds
   1. [Co(NH₃)₄Cl₂] Cl

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   2. K₃[Fe(CN)₆]
   3. [Pt(en)₂Cl₂](NO₃)₂
2. Discuss the classification of organometallic compounds.
3. Why are carboxylic acids stronger acids than phenols?

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4. Give any two methods for the preparation of nitro alkanes.
5. The conductivity of a solution containing 1 gram of BaCl₂ in 200 ml of water has been found to be 0.0058 mho cm^-1. What are the molar conductivity and equivalent conductivity of the solution ? (mol. Wt of Ba Cl₂ = 208).
6. Describe hydrogen electrode.

SECTION - B (4 x 15 = 60 Marks)

Note: Answer all questions from the following.

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1. (a) Discuss the formation of [Ni(CN)₄]^2-, [Cu (NH₃)₄]²⁺ and [Fe(CN)₆]^4- on the basis of valence bond theory (VBT).

   OR

   (b) (i) Explain any three preparative methods of ferrocene.
   (ii) What is 18 valence electron rule? Explain with two examples.
2. (a) Write note on :
   1. Schmidt reaction
   2. Hell-Volhard — Zelensky reaction

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   OR

   (b) (i) How do you obtain ethyl ketone from acetoacetic ester?
   (ii) Write reduction of nitrobenzene in alkaline medium.
3. (a) (i) How will you determine the transport number of an ion by Hittorf's method?
   (ii) A solution of silver nitrate containing 12.14g of silver in 50 ml of solution was electrolysed between platinum electrodes. After electrolysis, 50 ml of the anode solution was found to contain 11.55 g of silver, while 1.25 g of metallic silver was deposited on the cathode. Calculate the transport number of Ag⁺.

   OR

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   (b) (i) Discuss potentiometric titrations.
   (ii) Write the salient features of Arrhenius theory?
4. (a) Write the synthetic analysis of acetophenone and cyclohexanone.

   OR

   (b) (i) Draw the molecular orbitals of ethene and 1, 3 — butadiene.
   (ii) What is regio selective reaction? Explain with one example.

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