LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PLANT BIO. & PL. BIO-TECH.&ADV.ZOO
SUPPLEMENTARY EXAMINATION – APRIL 2008
CH 3104 - CHEMISTRY FOR BIOLOGIST - I
Date : 28-06-08
Time : 9.00 – 12.00
Dept. No.
Max. : 100 Marks
PART - A
10  2 = 20
Answer ALL the questions
‘The bond angles in methane, ammonia and water are different’. Why?
Compare the properties of ionic and covalent compounds.
Write the IUPAC names of the following complexes.
(a) Na4[Fe(CN)6 ]
(b) [Co(NH3)6]Cl3
4.
Define ionic product of water. Give the value of Kw.
5.
What is meant by zero order reaction? Give an example.
6.
What is peptisation? Give an example.
7.
What are lyophilic and lyophobic colloids? Give an example for each.
8.
Define half-life period of a reaction. How is it derived for a first order reaction?
9.
Mention the isomerism exhibited by maleic and fumaric acid. Draw its structures.
10. Why is triochloro acetic acid stronger than acetic acid?
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PART –B
Answer any EIGHT questions
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8 x 5 = 40
Draw the structures of the following biologically important complexes.
(a) Hemoglobin
(b) Chlorophyll
Differentiate inter and intra molecular hydrogen bonding with suitable examples.
Discuss the structure of (i) PCl5 and (ii) IF7 based on hybridization.
Define pH of a solution. Calculate the pH of 0.001M NaOH solution. Compare the strength of
0.001M HCl and 0.01M HNO 3 using pH.
What are primary standard solutions? Mention their prerequisites.
Discuss the various types of specificity shown by enzyme catalysed reactions.
Distinguish between the following:
(a) Heterogeneous and homogeneous catalysis
(b) Order and Molecularity of reactions.
Discuss the optical and kinetic properties of colloids.
Write a note on electro osmosis.
Discuss the optical isomers of tartaric acid.
What is vulcanization? How is the vulcanization of crude natural rubber done?
What is polymerization? Explain addition and condensation polymerization reactions with suitable
examples.
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PART - C
4 x10 = 40
Answer any FOUR questions
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28.
a) Explain Werner’s theory of coordination complexes.
(6)
b) Write a note on geometrical isomerism of square planar complexes.
(4)
a) Write a note on Vander Waals forces with suitable examples.
(5)
b) Discuss the structure of sodium chloride unit cell
(5)
a) What is a buffer solution? Discuss the buffer action of an acid buffer
(6)
b) Define common ion effect. Explain with suitable example.
(4)
Derive the rate constant for a first order reaction.
Give a method of preparation and uses of the following polymers.
a) Buna-S b) HDPE and LDPE c) Nylon-6,6
a) What are enantiomers? How are they separated from racemic mixture? (6)
b) Define the following:
(i) Normality
(ii) Mole fraction
(4)
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