Download OU B.Sc 2019 Dec 5th Sem (3rd Year) 8170 Chemistry Question Paper

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FACULTY OF SCIENCE

B.Sc. V-Semester (CBCS) Examination, November / December 2019

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Subject : Chemistry

Paper -V (DSC)

Max. Marks: 60

Time : 3 Hours

PART - A (5 x 3 =15 Marks)

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(Short Answer Type)

Note : Answer any five of the following questions.

1. Cupric sulphate is blue on heating strongly it become colourless why? Explain.
2. What are boranes and carboranes? Give one example each.
3. What is Carbyl Amine reaction? Write its use.

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4. How do you prepare diazonium salt? Write its equation.
5. What is half life period? A first order reaction is found to have rate constant K of 7.39 x 10^-5 sec^-1. Calculate the half life period of the reaction.
6. What are consecutive reactions? Give one example.
7. Explain about bathochromic and hypsochromic shifts.
8. Define phosphorescence and fluorescence, Explain with diagram.

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PART —B (45 Marks)

(Essay Answer Type)

Note: Answer ALL from the questions.

1. (a) Explain diagrammatically splitting pattern of d-orbitals in square planar complexes by taking one example.
   OR
   

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   (b) Explain the determination of magnetism moment (µ) of magnetic by Gouy's method Experimentally.
2. (a) Explain with mechanism of following reactions.
   1. Bromination
   2. Nitration of Aromatic Amines
   OR
   (b) Explain the electrophilic substitution reactions of Furan, thiophene and pyrrole.

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3. (a) What is a rate of reaction? Explain the factors influencing rate of reaction.
   OR
   (b) How do you determine order of reaction by Ostwald’s isolation methods.
4. (a) Explain the following photo chemical laws.
   1. Grothus — Draper law
   2. Stark Einstein’s law of photochemical equivalence

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   OR
   (b) Explain the modes of vibrations in poly atomic molecules by taking a example.

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