DB 08

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – November 2008

CH 3503 – MAIN GROUP ELEMENTS & SOLID STATE CHEMISTRY

 

 

 

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

Time : 9:00 – 12:00

 

PART – A

 

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

 

1. Lithium forms normal oxide while sodium forms peroxide. Account for.
2. When sodium is shaken with naphthalene in nonaqueous solution it turns paramagnetic. Why?
3. What is meant by catenation?
4. What are interstitial carbides?
5. Give the preparation of metaphosphoric acid.
6. How is hydroxylamine prepared?
7. Give the preparation of perchloric acid.
8. Iodine pentoxide is used to determine carbon monoxide. Why?
9. Distinguish between amorphous and crystalline solid.
10. What are Miller indices? Sketch the plane in a cube having Miller indices 110.

 

PART – B

 

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

 

11. Explain the role of Na⁺ and K⁺ ions in biological system.
12. How does Beryllium differ from other elements of Group 2? Discuss the main points of difference.
13. How does tetraborane undergo symmetric and unsymmetrical cleavage? Give its structure.
14. What is Borax? How is it prepared?
15. How is nitric oxide prepared? How does it react with acidified potassium permanganate?
16. How is orthophosphoric acid prepared? Write its structure.
17. Give the preparation and two uses of thionyl chloride.
18. How is available chlorine in bleaching powder determined?
19. Explain the structures of ClF₃­ and BrF₅ using VSEPR theory.
20. Explain the structures of i. CsCl and ii. zinc blende.

21.Write the salient features of Schottky and Frenkel defects.

22. Derive the Bragg equation for the diffraction of X-rays by crystals.

 

PART – C

Answer any FOUR questions                                                       (4 x 10 = 40 marks)

 

23.a. How is beryllium extracted from beryl?                                                (6)

1. Give an account of hydroxides and halides of s block elements          (4)
2. Write a note on sheet silicates and three dimensional silicates.
3. a. How is ozone prepared? Establish its structure. (5)
4. Give the preparation and uses of hydrazoic acid. (5)
5. Write a note on acidic, basic amphoteric and neutral oxides.
6. a. What are pseudohalogens? (5)
7. Compare the reactivity of halogens. (5)

28.a. Describe the three types of cubic unit cells among the Bravais lattices. Calculate the number of atoms per unit cell in each case.                                                                      (6)

1. Explain the structure of sodium chloride. (4)

 

 

 

 

 

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