FG 12

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

           B.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – APRIL 2008

    CH 3503 – MAIN GROUP ELEMENTS & SOLID STATE CHEMISTRY

 

 

 

Date : 29-04-08                  Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

PART – A

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

1. Indicate two uses of Lithium compound.
2. What is the role of K⁺ ion in biological systems.
3. Explain the amphoteric behaviour of Aluminium.
4. What are the raw materials used in manufacture of glass.
5. Explain the basicity of orthophosphoric acid.
6. How do you prepare Caro’s acid? Write its structure.
7. F₂o is called as oxygen difluoride while Cl₂O is named as chrorine oxide. Give reasons.
8. Discuss the structure of IF₅.
9. Draw 110, 111 planes.
10. What is the importance of radius ratio in ionic crystal? Give an example.

 

PART – B

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

1. How does Li differ from other elements of first group?
2. Describe ‘Wrap Around’ complexes of alkali metal ions.
3. What are election deficient compounds? Discuss the bonding and structure of diborane.
4. Write a note on classification of carbides.
5. How do you prepare (a) Hydrazine  (b) Hydroxylamine in the laboratory? Indicate two chemical reactions for each.
6. Write the manufacture of (a) Superphosphate of lime  (b)  triple superphosphate.
7. Describe the preparation of Marshall’s acid by anodic oxidation of H₂SO₄. Write its structure.
8. Write a note on Psuedohalogens.
9. Discuss the structure of Oxoacids of halogens? What is their relative acid strength?
10. Derive Bragg’s equations.
11. Describe the structure of (a) zinc blende  (b)  wurtzite.
12. What are Frankel defects? Explain with two examples.

 

PART – C

Answer any TWO questions.                                                           (2 x 20 = 40 marks)

1. (a) Describe the extraction of Beryllium from its ore.                                    (5)

(b) Write a note on organometallic compounds of Li and Be.                       (5)

1.  What are silicates? How are they classified? Describe the structure of various types of silicates.
2. How do you prepare (a) Hyponitrous acid (b) Pernitric acid  (c)  Pyrophosphoric acid  (d) metaphosphoric acid.  (e)  dithionic acid?
3. a) How is ozone prepared? Describe its structure                                           (4)

1. b) State different types of oxides with one example each. (6)

1. a) Discuss the preparation and structure of

1. ICl (ii) BrF₃  (iii) BrF₅                                                   (6)
2. b) How do you estimate available chlorine in bleaching powder? (4)

1. (a) Discuss the structure of (i) Rutile (ii) Fluorite                                           (5)

(b) What are different crystal systems. Give an example for each.                (5)

 

 

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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)