LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

WD 26

M.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – April 2009

CH 1807 – CONCEPTS IN INORGANIC CHEMISTRY

 

 

 

Date & Time: 25/04/2009 / 1:00 – 4:00   Dept. No.                                                    Max. : 100 Marks

 

 

PART – A

Answer all the questions                                                   (10 x 2 = 20)

 

1. What are the informations obtained from radial and angular wave functions?
2. Why is the ionization energy of Na⁺ ion higher than that of Ne though both are isoelectronic?
3. Which of the following is readily soluble in water i) PbCl₂ ii) PbCl₄? Suggest reason(s).
4. Why is CCl₄ not a Lewis acid while SiCl₄ and SnCl₄ are?
5. Why is the dipole moment of NH₃ greater than that of NF₃?
6. Calculate the effective nuclear charge felt by a 3d electron of nickel (atomic number=27).
7. Draw the (111) and (210) planes in a cube.
8. What is F-center?
9. What is leveling effect of solvent? Explain with examples.
10. What are pseudohalogens? Why are they considered so?

 

PART – B

Answer any eight questions                                                           (8 x 5 = 40)

 

1. Describe in detail the Slater’s rule and their important applications.
2. Define the following and explain their trends in a group. i) Atomic radius ii) eletronegativity  iii) electron affinity
3. Construct Born-Haber cycle for the formation of NaCl and explain how it is useful in calculating electron affinity.
4. What are London Forces? What is their origin?
5. Predict and explain magnetic properties of N₂ and O₂ molecules, using molecular orbital theory.
6. Explain Schottky and Frenkel defects in crystals.
7. Explain with examples, the factors favouring the formation of covalent character in ionic compounds.
8. Predict the structure of the following molecules using VSEPR theory.

(i) XeF₂  (ii) ICl₄^–.

1. Mention the rules for hybridization. Explain the structure of (i) POCl₃  (ii) CCl₄.
2. i) How are supramolecules different from clathrates?

1. ii) Explain the role of hydrogen bonding in the architecture of supramolecular assemblies.

1. Write short notes on i) symbiosis ii) proton sponges.

 

PART – C

Answer any four questions                                                             (4 x 10 = 40)

 

1. Derive Born-Lande equation to calculate the lattice energy theoretically? What are the factors that affect the lattice energy?
2. Explain the band theory of metals. What type of energy bands are obtained in i) sodium metal ii) an insulator iii) semiconductor.

Account for the following observations using molecular orbital theory:  i) the bond energy of NO⁺ is higher than that of NO ii) the bond length of CO⁺ is larger than that of CO.

1. Explain the Pearson’s concept of hard and soft acids and bases, with examples. Discuss any three applications of this theory.
2. Compare and contrast the principles involved in powder and single crystal X-ray diffraction analysis.
3. What is radius ratio rule? Discuss the structures of  zinc blende and perovskite

 

 

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