LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – CHEMISTRY
FIRST SEMESTER – April 2009
WD 03
CH 1503 - CONCEPTS IN INORGANIC CHEMISTRY
Date & Time: 22/04/2009 / 1:00 - 4:00
Dept. No.
Max. : 100 Marks
PART – A
Answer ALL the questions:
10 x 2 = 20
1. Define inert-pair effect with an example.
2. State Pauli’s exclusion principle.
3. Among F and C , which has more electron affinity? Why?
4. MgSO4 is less soluble than Na 2SO 4. Give reason.
5. Calculate the bond order in (a) O2
2
(b) O2 .
6. Describe the structure of X e F4 based on VSEPR Theory.
7. Among O-chloro phenol and p-chlorophenol, which is more volatile? Explain.
8. Explain ion dipole – dipole interactions of molecules.
9. Label the following as Acid or base. (a ) OH  (b) Cl  (c) BF3 (d ) NH 2  .
10. What are aprotic solvents? Give two examples.
PART – B
Answer any EIGHT questions:
8 x 5 = 40
11. Write a note on magnetic separation of ore dressing.
12. (a) Write the Schrodinger wave equation and explain the terms.
(b) What is the significance of wave function?
13. Discuss the diagonal relationship between Be and Al .
14. State and explain Fajan’s rules to explain the Covalent character of ionic compounds with
examples.
15. Explain the trend in ionisation potential values of elements belonging to Second Period.
16. Apply MO theory and draw MO energy level diagram for ‘NO’ molecule. Calculate bond order.
17. Based on Valence Bond Theory, discuss the geometry of (a) PCl5 (b) SF6 .
18. Explain the structure of (a) XeF6 (b) ICl2  using VSEPR Theory.
19. Write a note on clathrates.
20. What are Hume-Rothery rules? What are their significance in the structure of alloys?
21. Balance the following chemical reactions by oxidation number method.
(a) Cr2O7 2  Fe 2  H   Cr 3  Fe3  H 2O
(b) MnO4   H   C2O4 2  Mn 2  H 2O  CO2
22. Write a note on Lewis theory of acids and bases.
PART – C
Answer any FOUR questions:
4 x 10 = 40
23. Discuss various factors affecting the formation of ionic compounds with suitable examples.
24. How is electro negativity determined by (a) Pauling Method
(b) Mulliken – Jaffe Method.
25. Write electron dot formula for (a ) H 3 PO4 (b) PCl5 (c) BF3 (d ) IF5.
26. Describe the conditions for the combinations of atomic orbitals to produce Molecular Orbitals.
27. How does band theory explain the conducting properties of metals, Semi-conductor and
insulator?
28. Describe the role of liquid ammonia as a solvent for various types of reactions with examples.
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