LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc.

LM 04

DEGREE EXAMINATION – MATHS / PHYSICS

SECOND SEMESTER – APRIL 2007

 

CH 2102/2100/3100 – GENERAL CHEMISTRY FOR PHYSICS & MATHS

 

 

Date & Time: 23/04/2007 / 1:00 – 4:00            Dept. No.                                                     Max. : 100 Marks

 

 

 

PART-A

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

1. Why are transition metal compounds colored? Give an example.
2. Name the following compounds systematically.
3. a) [Cr(en)₂(NH₃)₂]Cl₃ b) K₃[Fe(H₂O)(CN)₅]
4. Draw the resonance structures of phenol.
5. How is nitronium ion generated for nitration reaction?
6. Define Henry’s law. What are its drawbacks?
7. State Grothus-Draper law.
8. Draw the structure of Adenosine nucleotide.
9. Write a short note on adrenaline.
10. Bring out the differences between thermoplastics and thermosetting plastics.
11. Define corrosion. Give any two examples.

 

PART-B

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

11. Calculate the EAN and predict whether the following complexes are stable or not.
12. a) [Fe(CN)₆]^3- b) [Pt(Cl)₄]^2-
13. Discuss the geometrical isomerism exhibited by the complexes with coordination number 4 and 6.
14. Explain the mechanism of chlorination of benzene.
15. Draw the potential energy diagram for the conformational changes of n-butane along C₂-C₃ axis.
16. Write the mechanism of S_N1 reaction with an example.
17. Compare ideal and non-ideal solutions. Give an example for each.
18. Discuss the phase diagram of phenol-water system in detail.
19. Explain how chlorophyll is helpful for photosynthesis.
20. Give a detailed account on sex hormones.
21. Discuss on the structure and types of RNA in detail.

 

 

 

21. How are Nylon66 and polystyrene synthesized? Mention their uses.
22. Mention any two methods of prevention of corrosion in detail.

 

PART-C

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

23     a) Explain Werner’s coordination theory in detail.                                (5)

1. b) Using valence bond theory, bring out the structure and magnetic property of the following compounds. (2 ´ 2½)
2. i) [Cu(Cl)₄]^2-                           ii) [Fe(H₂O)₆]²⁺

24     a) How will you distinguish maleic acid from fumaric acid? Explain any two methods.                                                                                                (5)

1. b) Define the following terms. (1 + 2 + 2)
2. i) Chirality ii) Enantiomers            iii) Diastereomers

25     Discuss the phase diagram of one component system in detail.                        (10)

26     a) Define half-life period. Calculate the t_1/2 of a first order reaction.                (5)

1. b) Discuss the causes of corrosion. (5)

27     a) Draw the structure of the following                                                          (2 ´ 2½)

1. i) uracil ii) adenine
2. b) Differentiate DNA and RNA with any five points. (5)

28     How will you differentiate the following?                                                        (5 + 5)

1. a) Condensation polymerization and addition polymerization
2. b) Natural polymers and synthetic polymers.

 

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