LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

DB 22

M.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – November 2008

    CH 1807 – CONCEPTS IN INORGANIC CHEMISTRY

 

 

 

Date : 06-11-08                 Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

PART – A

 

Answer all the questions                                                        (10 x 2 = 20)

 

1. How is effective nuclear charge calculated?
2. Explain the influence of charge density on electron affinity of fluorine.
3. What are the factors to be considered for predicting chemical properties of an element?
4. How are the shapes of orbitals arrived at?
5. What is F-centre?
6. Why is the bond length of O₂²⁺ less than that of O₂?
7. Explain why CCl₄ does not act as Lewis acid while SiCl₄ and SnCl₄ do so.
8. Why is the dipole moment of NH₃ greater than that of NF₃?
9. Differentiate semiconductors and superconductors.
10. Differentiate spinel and inverse spinel structures of oxides.

 

PART – B

Answer any eight questions                                                  (8 x 5 = 40)

 

11. Describe the three types of cubic unit cell among the Bravais lattices? Calculate the number of atoms per unit cell in each case.
12. Define the following and explain their trends in a period and in a group giving reasons:
13. a) electron affinity b) electronegativity c) atomic radius d) ionisation energy
14. How is Born-Haber cycle useful in predicting feasibility of formation of an ionic crystalline compound? Explain with an example.
15. Explain with examples, the factors favouring the formation of covalent character in ionic compounds.
16. Give the energy level diagram, electronic configuaration and bond order of NO,  NO⁺, NO^–
17. Predict the structures of the following molecules using VSEPR theory.

(i) XeF₄                               (ii) ICl₄^–.

17. What are intermolecular forces? How do these forces originate?
18. How are clathrates prepared? Mention their uses.
19. Explain the role of liquid ammonia i) acid- base reactions ii) complexometric reactions.
20. Explain the acid-base concepts by (i) Lux-flood (ii) solvent system concept.
21. What are Miller indices? Sketch the planes with Miller indices

(a) (111)       (b) (110)             c) (112)            (d) (312)

22. Discuss the structure of zinc blende.

 

PART – C

 

         Answer any four questions                                                   (4 x 10 = 40)

 

23. Derive Born-Lande equation.
24. Write an essay on defects in ionic crystals and their consequences.
25. Explain why the molecule of CO is diamagnetic and NO is paramagnetic, using M.O theory.
26. Explain the band theory of metals. How does this theory explain the conductance behaviour of metals?
27. Explain the Pearson’s concept of hard and soft acids and bases, with examples. Discuss any three applications of this theory.
28. Describe the basic principles and methodology of X-ray diffraction analysis.

 

 

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