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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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

LM 25

M.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – APRIL 2007

CH 1802 – STRUCTURAL INORGANIC CHEMISTRY

 

 

 

Date & Time: 30/04/2007 / 1:00 – 4:00      Dept. No.                                       Max. : 100 Marks

 

 

Part – A

 

Answer all the questions                                                   (10 x 2 = 20)

1. What are the factors affecting the formation of ionic compounds?
2. Which compound does possess high melting point i) FeCl₂ ii) FeCl₃
3. What are the different types of close packing of ions?
4. Why is the bond length of O₂²⁺ less than that of O₂^2-?
5. Why is the bond angle of NH₃ greater than that of H₂O?
6. What are n-type and p-type semiconductors?
7. What is symbiosis? Give an example.
8. What are the types of defect in solids? Explain with an example.
9. What are zeolites? Mention their uses.
10. What are hetero polyacids and homo polyacids? Give an example.

 

Part – B

Answer any eight questions                                                           (8 x 5 = 40)

 

11. Calculate the volume occupied by ions or atoms in face-centred cubic arrangement.
12. Explain with examples, the factors favouring the formation of covalent character in  ionic

compounds.

13. Predict the structure of the following molecules using VSEPR theory.
    (i)XeF₂               (ii)ICl₄^–.
14. What are the conditions of resonance and give the resonance structure of
    (i) NO₂               and (ii) CO₃^2- ion
15. Explain the postulates of hybridization and discuss structure of
    (i) PCl₅ and (ii)   SF₆.
16. How are clathrates prepared? Mention their uses.
17. Describe the basic principles involved in neutron diffraction studies and give any

two applications.

18. Explain Lux-Flood concept of acids and bases.
19. Discuss the structure, properties and bonding of N₃P₃Cl₆
20. Explain Why Mn₃O₄ is normal spinel whereas Fe₃O₄ is an inverse spinel
21. How are metallocarboranes prepared? Mention any one structure.
22. What are silicates? How are they classified? Give an example for each class.

 

 

Part – C

 

Answer any four questions                                                             (4 x 10 = 40)

 

23. Define lattice energy. How is lattice energy calculated theoretically and experimentally?
24. Explain why the molecule of CO is diamagnetic and NO is paramagnetic, using M.O  theory.
25. How does band theory explain the conductance behaviour of conductors, insulators  and

semiconductors?

26. Explain the Pearson’s concept of hard and soft acids and bases, with examples.

Discuss any four applications of this theory.

27. What is radius ratio? Discuss the structures of (a) NaCl (b) Rutile.
28. (i) What are Miller indices? Draw (111) and (110) plane                                 (6)

(ii)Apply Wade’s rule to predict the geometry of B₁₀H₁₀^2-                                (4)

 

 

 

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