LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & BIOTECHNOLOGY

AD 04

THIRD SEMESTER – NOV 2006

CH 3102 – CHEMISTRY FOR BIOLOGISTS – THEORY

(Also equivalent to CHE 102)

 

 

Date & Time : 28-10-2006/9.00-12.00      Dept. No.                                                       Max. : 100 Marks

 

 

 

PART – A

Answer all the questions                                                     (10 ×2 = 20 marks)

1. Draw the structure of CsCl and label it.
2. Write any four postulates of VSEPR theory.
3. Write the IUPAC nomenclature for the following compounds
   a) [Cr(NH₃)₆]Cl₃             b) K[Ag(CN)₂]
4. Define the following terms.
   a) Molality b) mole fraction.
5. What is the principle of volumetric analysis?
6. Write the rate of the following reaction
   2NO_(g) + 2H_2(g) à N_2(g) + 2H₂O_(g)
7. What is peptization?
8. ‘p-nitrophenol is more acidic than phenol.’ Why?
9. Differentiate resolution and raecemization.
10. How is nylon-66 prepared?

 

PART – B

Answer any eight questions                                                (8 × 5 = 40 marks)

11. Discuss the shape of PCl₅ and BF₃ based on VSEPR theory.
12. Explain the types of hydrogen bonding with examples.
13. Discuss the primary and secondary standards.
14. Explain any two theories of acids and bases.
15. Derive the rate expression for a second order reaction 2A à
16. Explain the role of enzyme as catalyst in chemical and biochemical reactions.
17. Discuss the optical and kinetic properties of colloids.
18. Draw the resonance structure of the following
    a) nitrobenzene b) phenol.
19. Explain any two methods of resolution of racemic mixtures.
20. Write short notes on
    a) enantiomers b) chirality        c) meso compound             (2 + 1.5 + 1.5)
21. Draw the structure of the monomers used to prepare the following polymers.
    a) polypropylene b) polyvinyl chloride   c) Teflon          d) buna-S
22. Discuss the different types of polymers.

 

PART – C

Answer any four questions                                                (4 × 10 = 40 marks)

 

23. a) Describe the shape of IF₇ using VSEPR theory.
    b) Discuss geometrical and optical isomerism in coordination compounds with an example for each. (4+6)
24. a) Write a note on dipole-induced dipole interaction.
    b) Derive the Henderson equation of buffer solutions. (4+6)
25. a) Discuss any two methods of determining order of the reaction.
    b) Define the terms homogeneous and heterogeneous catalyst with one example for each. (6+4)
26. a) Derive the half-life period of first order kinetics of a reaction.
    b) Discuss the applications of colloids. (5+5)
27. a) Write the order of acidity of the following CH₃COOH, CCl₃COOH, CF₃COOH b) Write the order of basicity of the following NH₃, R-NH₂, R₂NH, R₃
    c) Explain the optical activity of lactic acid. (2+2+6)
28. a) Discuss the methods used to differentiate geometrical isomers.
    b) Explain the mechanism of chain growth polymerization. (5+5)

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