LOYOLA  COLLEGE (AUTONOMOUS), CHENNAI-600 034.

M.Sc. DEGREE  EXAMINATION  – chemistry

first  SEMESTER  – APRIL 2003

CH  1802/CH 719  structural inorganic chemistry

08.04.2002

1.00 – 4.00                                                                                          Max: 100 Marks

 

PART – A                                                     (10 ´ 2 = 20 Marks)

Answer the following

1. Mention one example each for spinel and inverse spinel.
2. Mention coordination numbers in fluorite and antifluorite structures.
3. Suggest a technique to study the following

(a) hydrogen bonding in ice  (b) bond length in diborane.

4. ZnO acts as a n- type semiconductor.
5. Predict the structure of B₄ H₁₀ applying Wades Rules.
6. What is radius ratio? What is its significance?
7. Taking H₂ molecule as example show how molecular orbitals are obtained?
8. How are n and p-type extrinsic semiconductors prepared?
9. Explain van der Waal’s forces.
10. What are gas hydrates and clathrates? Cite examples.

 

PART – B                                                          (8 ´ 5 = 40 Marks)

Answer any eight of the following

11. Discuss and compare the structures of Wurtzite and Zinc blende.
12. How are silicates prepared? Mention their applications.
13. How are metallocarboranes prepared?
14. Mention the advantages of single crystal X-ray diffraction analysis.
15. Write a note on Schottky and Frenkel defects.
16. How is structure factor derived for an array of atoms in a crystal lattice?
17. What is Madelung constant? Calculate this constant for NaCl crystal

(first two terms only)

18. How is lattice energy calculated using Born-Haber cycle?
19. Discuss factors which influence hard/soft nature of cations.
20. Construct MO diagram for NO molecule and explain its magnetic property and stability.
21. Arrange the following molecules according to increasingbond angles.

Give reason(s) (i)  CH₄  (ii) CH₂F₂   (iii)  CH₂I_2.

 

 PART –C                                                     (4 ´10= 40 Marks)

Answer any four of the following

22. How are phosphonitric compounds prepared?

Discuss the structure of P₃ N₃ Cl₆.

23. Discuss the following structures and draw silicate units:

(i) beryl        (ii) talc  (iii) quartz (iii) pyrosilicate           (3+3+2+2)

24. Discuss structures of spinels and inverse spinels taking Mn₃ O₄as typical examples.
25. Explain Fajan’s Rules with suitable examples.
26. Using band theory discuss conductance properties of (i) Mg (I)Hg (iii) I₂    (3+3+4)
27. Write an essay on non-equeous solvents and their applications.

 

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