LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – NOVEMBER 2010

CH 3503 – MAIN GROUP ELEMENTS & SOLID STATE CHEMISTRY

 

 

 

Date : 02-11-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

 

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

 

1. Why does the basic strength of hydroxides of alkali metals increase on moving down the group?
2. Beryllium and magnesium do not impart any colour to the flame. Why?
3. What is meant by catenation?
4. How does aluminium react with dilute mineral acids and strong alkali solutions?
5. How is carbon suboxide prepared?
6. Write the structure of caro’s acid.
7. Give the preparation of perchloric acid.
8. What are pseudohalogens? Give one example.
9. Represent (110) plane of cubic structure.
10. Calculate the relative sizes of the anions and cations required for a perfect fit of the cation into

the octahedral sites in a close packed anion array.

 

PART – B

 

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

 

11. Explain the role of Na⁺ and K⁺ ions in biological system.
12. Write briefly on anomalous behavior of lithium.
13. What is Borax? How is it prepared?
14. What are interstitial carbides? Explain with an example.
15. Write a note on sulphides of phosphorus.
16. Explain the preparation and structures of oxides of nitrogen.
17. How is orthophosphoric acid prepared? Write its structure.
18. How is available chlorine in bleaching powder estimated?
19. How are dichlorine monoxide and iodine pentoxide prepared?
20. Derive Bragg’s equation for X-ray diffraction.
21. Explain the crystal structure of fluorite.
22. How are seven solid systems, classified into Bravais lattices?

 

PART – C

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

 

23. a) How is beryllium extracted from beryl? (6)
24.  b) Give an account of  hydroxides and halides of s block elements                                            (4)
25. Discuss the structures and properties of chain and sheet silicates.
26. a) Give the preparation and uses of hydrazoic acid. (5)
27.  b) How are superphosphate and triple superphosphate prepared?
28. a) How are oxides classified? Give an example for each type. (5)
29. b) Explain the structure of diborane. (5)
30. What are interhalogen compounds? How are they classified? Explain the structures of
    ClF₃ and IF₅.
31. a) Discuss (i) Frenkel defect and (ii) Schottky defect. (6)
32. b) What are Miller indices. (4)

 

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