3LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – APRIL 2011

CH 1503/CH 1500 – CONCEPTS IN INORGANIC CHEMISTRY

 

 

 

Date : 06-04-2011              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

 

Answer ALL questions.                                                                                              (10 x 2 = 20marks)

 

1. What are the possible values of quantum numbers n, l ,m and s for an electron in 3d orbital?
2. The metallic character increases in the order As< Sb <Bi. Substantiate.
3. What would be the effect on lattice energy of increasing the charge on M ⁿ⁺?
4. What is inert pair effect?
5. Explain the shape of beryllium chloride, using the concept of hybridization,
6. He₂ ⁺ exists while He₂ does not. Why?
7. What are London forces?
8. Why is sodium in liquor ammonia blue?.
9. HgO is soluble in HCl but HgS is not. Reason out using HSAB principle.
10. What are aprotic solvents? Give one example.

PART – B

 

Answer any EIGHT questions.                                                                                             (8 x 5 = 40 marks)

 

11. Describe the method of froth floatation.
12. How is electronegativity expressed using Mulliken-Jaffé and Allred -Rochow scales? Explain.
13. What is electrochemical series? Give one application of this series.
14. State and explain Fajan’s rules.
15. Using VSEPR theory arrive at the structures of XeF₄ and XeF₆ .
16. Explain the factors that affect lattice energy.
17. State and explain isoelectronic principle.
18. Construct the qualitative MO energy level diagram of oxygen and account for its paramagnetism.
19. State and explain Hume – Rothery rules.
20. What are interstitial solid solutions? Explain.
21. What are the characteristics of hard and soft acids and bases?
22. What are leveling and differentiating solvents? Explain with an example for each.

 

 

PART – C

Answer any FOUR questions                                                                                             (4 x 10 = 40 marks)

 

23.What is an Ellingham diagram? With the help of this diagram, fix the criterion for

1. Reduction of metal oxide by carbon at a given temperature
2. Reduction of oxide X₂O₃ by a metal Y and

iii. Reduction of metal oxide by hydrogen.

 

24. a) Construct and explain, Born-Haber cycle for determination of lattice energy of sodium chloride. (6)

 

1. b) What is Born – Lande equation.              (4)

 

25. Using the molecular orbital diagram, explain the magnetic properties and stabilities of CO and N₂.

 

26. Write a comparative account of the VB and MO theories of bonding.

 

27. Distinguish between conductors, semiconductors and insulators on the

basis of band theory.

 

28. Describe the following reactions in liquid ammonia giving an example for each:
29. Acid-base reactions ii. Precipitation reactions  iii. Complex formation reactions and
30. Ammonolysis.                                                                                                 (10)

 

 

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