LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – APRIL 2011

CH 3503/CH 4501 – MAIN GROUP ELEMENTS & SOLID STATE CHEMISTRY

 

 

 

Date : 25-04-2011              Dept. No.                                                  Max. : 100 Marks

Time : 1:00 – 4:00

 

PART –A

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

 

1. Give the carbonates and bicarbonates of sodium. Mention their uses.
2. Explain the reaction of alkali metals with water with an example.
3. Define catenation.
4. Name any two types of glass. Give an example.
5. What is superphosphate of lime?
6. List the oxyacids of nitrogen and phosphorous.
7. Draw the structure of BrF₃.
8. What are pseudohalogens? Give an example
9. What are the coordination number of Na and Cl in Sodium Chloride?
10. What are Miller indices?

 

PART – B

 

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

 

11. Discuss the biological importance of alkali metals.
12. How is beryllium extracted from its ore?
13. Explain the reaction of Boron with oxygen?
14. Discuss the bonding in diborane.                                              (2 +3)
15. How are carbides classified?

15 Give the properties and uses of a) Phosphine   b) hydroxylamine.

16. Discuss the preparation and properties of Caro’s and Marshall’s acid.
17. Discuss the oxides of nitrogen.
18. How is available chlorine in bleaching powder determined?
19. Discuss the strength of oxoacids of halogens.
20. Explain the Schottky and Frenkel defects of crystals.

21 Explain limiting radius ratio. How is it used to determine the geometry of ionic crystals?

22. Draw the unit cells of sodium chloride and Zinc blende. Give their salient features.

 

 

PART –C

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

 

23. Give a comparative account of oxides, hydroxides, and hydrides of alkali metals.
24. What are silicates? How are they classified?
25. Write a note on acidic, basic, amphoteric and neutral oxides.
26. a) How is ozone prepared? Discuss it structure and uses.
27. b) How does aluminum react with dilute HCl and NaOH solutions.
28. Discuss the structure of a.BrF₅ b. ClF₃     c. ICl   d. IF₃   using VSEPR theory.
29. How is X-ray diffraction technique used to study the structure of crystals?

 

 

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