LOYOLA COLLEGE (AUTONOMOUS), CHENNAI-600 034.

B.Sc. DEGREE EXAMINATION – MATHEMATICS/PHYSICS

THIRD SEMESTER – NOVEMBER 2003

CH 3100 / CHE 100  – ALLIED CHEMISTRY

 

08.11.2003

09.00 to 12.00                                                                                             Max. 100 Marks.

PART – A

Answer ALL questions.                                                                       (10 x 2 = 20 marks)

 

1. Draw the resonance structures of phenol.
2. State Raoult’s law.
3. Define ‘degrees of freedom’.
4. Write the structure of PVC.
5. N,N-Dimethyl-o-toluidine is a stronger base than N,N-Dimethyltoluene. Why?
6. What are the advantages of variable oxidation states of transition metals?
7. Name the following coordination compounds.
8. a) [Ni(CO)₄]         b) [Cr(NH₃)₄Cl₂]Cl
9. Draw the structure of the following compounds.
10. a) adenine         b) ribose sugar
11. Define the order of a chemical reaction.
12. State Grotthus-Draper Law.

 

PART – B

Answer any EIGHT questions.                                                               (8 x 5 = 40 marks)

 

11. Draw the optical isomers of tartaric acid and explain.
12. Draw the conformational isomers of n-butane and explain.
13. What is an S_N2 reaction? Explain its mechanism.
14. Explain positive deviation from Raoult’s Law with an example.
15. Draw the phase diagram of water. Apply the phase rule to any one point, line and

area.

16. Write a note on vulcanization of rubber.
17. Using valence bond theory, bring out the structures of
18. a) [ Cu(NH₃)₄]Cl₂   b) [Cr(H₂O)₆]Cl₃
19. What is EAN rule? Apply it to a) K₃[Fe(CN)₆] and b) [Ni(CO)₄]
20. Explain Watson-Creek model of DNA.
21. Write short notes on the following hormones?
22. a) Prostaglandins b) Thyroxine
23. Write the relation connecting rate constant and concentration for a) I order and
    b) II  order reactions.
24. How is copper estimated by photoelectric colorimetry?

PART – C

Answer any FOUR questions.                                                               (4 x 10 = 40 marks)

 

23. a) Explain the phase diagram of phenol-water system.
24. b) Write the mechanism of nitration of benzene.
25. a) How is terylene manufactured? Write the equation.
26. b) How will you determine pH by using a glass electrode?
27. What is corrosion? Write the electrochemical mechanism of it. How will you

prevent corrosion by galvanization and cathodic protection?

26. a) Give a short note on the magnetic properties of transition elements?
27. b) Discuss on the geometrical and optical isomerisms in the coordination compounds  with an example for each.
28. a) “DNA forms RNA; RNA makes proteins- Explain?
29. b)  Write a short notes on “adrenaline”.
30. a) “What is replication of DNA”. Explain the mechanism.
31. b)  Explain heterogeneous catalysis with two examples.

 

 

 

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