LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

GH 9

B.Sc. DEGREE EXAMINATION – MATHEMATICS & PHYSICS

THIRD SEMESTER – APRIL 2008

        CH 3202 / 3200 – ADV. GENERAL CHEMISTRY FOR PHYS.& MATHS

 

 

 

Date : 05/05/2008                Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

PART A

Answer all the questions                                                                                      10 x 2 = 20

1. Why the molecular weight of acetic acid in benzene is 120?
2. ‘Ethanol is soluble in water but not thiol’. Why?
3. Draw the resonance structures of thiophene.
4. How is aspirin prepared? Give the equation.
5. Define enthalpy of combustion with an example.
6. Define equivalent conductance.
7. How is the presence of –OH groups in fructose determined?
8. Give an example for the optical specificity of an enzyme.
9. What is the role of humus in agricultural chemistry?
10. How is DDT prepared?

PART B

Answer any eight questions                                                                                  8 x 5 = 40

11. What are the types of hydrogen bonding? Explain with examples.
12. How is lanthanides extracted by ion exchange method?
13. Write a note on the following.
14. a) Vat dyes b) direct dyes.
15. How is naphthalene prepared by Haworth synthesis?
16. State Hess’s law and explain how the law is used to calculate the enthalpy of a reaction.
17. How is malachite green prepared?
18. Draw and explain saturated calomel electrode.
19. How is conductometric titration helpful for the precipitation titrations?
20. How is N-terminal of an amino acid determined by Sanger’s method?
21. What is competitive inhibition? Explain with an example.
22. Explain the different types of soil.
23. Discuss the principle involved in the nuclear fission reaction.

PART C

Answer any four questions                                                                                4 x 10 = 40

 

23. a) Explain the lanthanide contraction.
24. b) Explain the mechanism of bromination of naphthalene.               (4+6)
25. What are chemotherapeutic drugs? Explain with examples.
26.       Define lattice energy. How is it determined?
27. a) Derive Kirchoff’s equation.
28. b) The molar conductance of sodium acetate, hydrochloric acid and sodium chloride at infinite dilution are 91.0´10^-4, 426.16´10^-4 and 126.45´10^-4 Sm²mol^-1 respectively at 25° Calculate the molar conductance at infinite dilution for acetic acid.                                  (6+4)
29. a) Describe the secondary structure of proteins.
30. b) What are the factors affecting the enzymatic activity? Explain.                (6+4)
31. Explain the role of macro and micro nutrients in agricultural chemistry.

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

DB 05

   B.Sc. DEGREE EXAMINATION – MATHS & PHYSICS

THIRD SEMESTER – November 2008

CH 3202 / 3200 – ADV. GENERAL CHEMISTRY FOR PHYS.& MATHS

 

 

 

Date : 13-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART-A

Answer all the questions                                                                           (10×2= 20)

 

1. Mention any two methods involved in the detection of hydrogen bonding?
2. H₂O has a higher boiling point than H₂S. Justify.

3. Define lattice energy.
4. Give a method of preparation of pyrrole.
5. Define Internal energy.
6. What is solubility product?
7. How is energy transformed in photosynthesis reaction?
8. What are transferases? Give an example.
9. Differentiate renewable sources from non renewable sources of energy.
10. Mention two advantages of mixed fertilizers.

PART-B

Answer any eight questions                                                                      (8×5= 40)

11. Discuss lanthanide contraction giving causes and its consequences.
12. How are the following prepared? Give equations. a) Congo red b) Malachite green.
13. Give a synthetic method of preparation and uses of asprin.
14. Write any one method of preparation of furan and explain the nitration of furan with example.
15. Discuss the classification of dyes based on their structure.
16. How is (a) pyridine converted to 2- nitro pyridine and (b) pyrrole to pyrrole-2-aldehyde
17. What are broad spectrum antibiotics? Give two examples with uses.
18. What are carbohydrates? How are they classified?
19. Describe Sanger’s method for the sequential determination of amino acid.
20. What are enzymes? Give any four properties of enzymes.
21. Write short notes on thermal cracking and catalytic cracking of liquid fuels.
22. Mention any four functions each for macro and micro nutrients in plants growth.

PART-C

Answer any four questions                                                                      (4×10= 40)

23. i) Define hydrogen bonding. Explain the two types of hydrogen bonding with example. (7)
24. ii) Why do ice float on water? (3)
25. i)Explain the working principle of secondary reference electrode.(5)
26. ii) How is naphthalene prepared by Haworth synthesis? (5)
27. i) What are the factors affecting lattice energy? (5)
28. ii) Derive the variation of enthalpy of reaction with temperature.(5)
29. i) Draw and explain the working principle of calomel electrode. (6)
30. ii) Explain Hess’s law. (4)
31. i) Establish the open chain formula of fructose. (7)
32. ii) Discuss the secondary structure of protein in detail. (3)
33. Explain any two of the following. (5+5)
34. a) Nuclear fusion b)  Herbicides   c) Phosphatic fertilizers  d) Fungicides

 

 

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