LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

DB 01

FIRST SEMESTER – November 2008

CH 1500 – INORGANIC CHEMISTRY – I

 

 

 

Date : 12-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

Answer all the questions:                                                              (10 x 2 = 20 marks)

 

1. How does Ionisation potential vary across a period?
2. Arrange the following in the increasing order of ionic character: .
3. Why an anion is always bigger and a cation is always smaller than the parent atom?
4. Calculate the bond order of N₂.
5. Why H₂S is a gas whereas H₂O is a liquid at 298k.
6. What are London forces? Give its origin?
7. Arrange the following acids according to their increasing acid strength with relevant explanation:
8. Give an example each for protic and aprotic solvents.
9. How Caro’s acid can be prepared.
10. Complete the reactions:

 

 

PART – B

Answer any Eight                                                                           (8 x 5 = 40 marks)

 

11. What is Lattice energy? How is it determined for the formation of NaCl using Born Haber cycle.
12. Calculate the electornegativity of Si following allred-rochow procedure. Covalent radius of Si=1.75 Ǎ.
13. Like compounds dissolve in like solvents – comment.
14. Discuss the hybridization and structure of SF₆ and BeF₂.
15. Give the importance of LCAO method.
16. What are clathrates? Explain with an example.
17. What is difference between Valence Band and Conduction band.
18. What is conjugate acid-base pair? Give two examples.
19. Complete the reaction

 

 

 

20. Compare the stability of NH₃ and PH₃.
21. How Hydrazine is prepared? Give any three of its reactions.
22. Write notes on the various allotropic forms of sulphur.

 

 

 

PART – C

Answer any four                                                                             (4 x 10 = 40 marks)

 

23. (a) Discuss Fajan’s rule with suitable examples.

(b) Calculate the lattice energy of sodium chloride using Born-Haber cycle.

Heat of sublimation of sodium (S) = 108.5kJ/ Mol

Dissociation energy of Cl₂(D) = 243.0kJ/ Mol

Ionization energy of sodium (I.E) = 495.2 kJ/Mol

Electron affinity of Chlorine (EA) = -348.3 kJ/ Mol

Enthalpy of formation of NaCl(ΔH_f)=-381.8 kJ/Mol

24. Arrange the following species in the order of increasing order of bond strength and explain:

O₂⁺, O₂^–, O₂ ,O₂ ²⁺, O₂^2-

25. (a). Based on VB theory predict the magnetic property of Oxygen molecule.

(b). Give the preparation, properties and uses of Hydrazine.

26. How does band theory of metals explain the conduction property of metals.
27. Explain HSAB theory. Mention any four applications.
28. Write in detail the properties and structures of various oxides of sulphur.

 

 

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