LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

DB 04

B.Sc. DEGREE EXAMINATION – ADV.ZOOLOGY&PLANT BIO & BIOTECH

THIRD SEMESTER – November 2008

CH 3104/CH 3102 – CHEMISTRY FOR BIOLOGISTS – I

 

 

 

Date : 11-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

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

1. Define ionization energy.
2. What is dipole-induced dipole interaction?
3. Why do ionic compounds usually have high melting points?
4. Calculate the pH of a solution whose H⁺ ion concentration is 0.5 mol/litre.
5. What is hybridization? Give an example.
6. Differentiate between order and molecularity.
7. What is peptisation?
8. Why is chloroacetic acid stronger than acetic acid?
9. What is chiral carbon? Give an example.
10. Arrange the following in the increasing order of basicity:

1. a) NH­₃ b) CH₃NH₂ c) (CH₃)₂NH             d) (CH₃)₃N

PART – B

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

1. What are the factors influencing the formation of ionic bond?
2. Discuss the optical isomerism in octahedral complexes with examples?
3. What are hydrogen bonds? How are they classified? Cite an example for each type.
4. Write briefly about homogeneous and heterogeneous catalysis with examples.
5. Derive the dissociation constant for weak acid.
6. Explain the characteristics of a primary standard substance.
7. Explain the kinetic and optical properties of colloids.
8. What is resonance? Discuss the resonance structure of the following:

1. a) phenol b) nitrobenzene

1. Discuss the application of colloids.
2. Explain the structure of BF₃ and NH₃
3. What are enantiomers and diasteriomers? Give an example.
4. a) Define normality.

5. b) What is the normality of solution containing 5.3g of NaOH in 250 mL.

 

PART – C

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

 

23. Discuss the postulates of Werner’s theory.
24. Write short notes on a) Electrophoresis b) Electro osmosis
25. Derive the rate expression for a second order reaction 2A® products.
26. How are the following polymers manufactured?

(a) Nylon-6,6            (b) Teflon               (c) PVC          (d) Buna-S

27. Explain any two methods of separation of racemic mixture.
28. Explain postulates of VSEPR Theory. Predict the geometries of IF₇, CH₄ and PCl₅

using VSEPR theory.

 

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