LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

WD 11

THIRD SEMESTER – April 2009

CH 3503 – MAIN GROUP ELEMENTS & SOLID STATE CHEMISTRY

 

 

 

Date & Time: 05/05/2009 / 1:00 – 4:00  Dept. No.                                                    Max. : 100 Marks

 

 

 

PART – A                                                                              (10 x 2 = 20)

ANSWER ALL THE QUESTIONS

 

1. Why do group I elements have the lowest first ionization energy values ?
2. Write the structure of beryllium chloride in the gaseous and solid state.
3. Write the reaction of aluminum with dilute mineral acid.
4. How does diborane react with ammonia at different conditions ?
5. How is tripe super phosphate obtained ?
6. Write the structure of perdisulphuric acid.
7. Fluorine is the most reactive of all the elements. Why ?
8. What are pseudohalides ?  Give examples.
9. What are Miller indices ?
10. Define isotropy.

 

PART – B                                                                        (8 x 5 = 40)

ANSWER ANY EIGHT QUESTIONS

 

1. How lithium differs from the other group I elements ?
2. What are the uses of the compounds of group I elements ?
3. How are amorphous and crystalline boron extracted ?
4. What are the different types of silicates ?
5. How is hydroxylamine prepared ?  Write the reaction of it with HCl and H₂SO₄.  Mention its uses.
6. Draw the structures of phosphorous trioxide and pentoxide.
7. How is hydrazine prepared ? Give two of its reactions.
8. How is dichlorine monoxide prepared ?  Mention its reactions and structure.
9. Mention one method of preparation of a) HClO₃    b) HClO₄
10. Mention the different types of crystals.  Give one example each.
11. What is crystal defect ?  Explain one of it.
12. Draw and explain simple cubic, face centered cubic and body centered cubic system.

 

PART – C                                                                                    (4 x 10 = 40)

 

ANSWER ANY FOUR QUESTIONS

23. a) How is sodium metal extracted ?                                                              (5)
24. b) How beryllium differs from the other group II elements (5)
25. a) Write a note on the structure of borates.
26. b) Explain the different types of carbides
27. a) What are the different types of oxoacids of phosphorus ?

Draw their structures.                                                                                (2+4)

1. b) How are oxides classified ? Explain. (4)
2. a) Compare the properties of phosphorous trichloride and phosphorous penta

chloride.

1. b) Write the preparation and properties of nitric acid.
2. a)   What is an interhalogen compound ?  Mention their different types.  Give one

example of each.

1. b) Write the chemical properties of ClF, ClF₃    and  I F₇
2. a)  How is X-ray diffraction technique used in the study of crystals ?
3. b) Derive Bragg’s equation for diffraction of X-rays by crystals.

 

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