LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

AD 01

FIRST SEMESTER – NOV 2006

CH 1500 – INORGANIC CHEMISTRY – I

(Also equivalent to CHE 500)

 

 

Date & Time : 03-11-2006/1.00-4.00   Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

 

Answer all the questions                                  (10 x 2 = 20)

 

1. What are the factors affecting the lattice energy?
2. Which are readily soluble in water (a) CaCO₃ (b) K₂CO₃. Give reasons for your answer.
3. Why an anion is always bigger and a cation is always smaller in size than the parent atom?
4. Give the Lewis structure of ammonia molecule.
5. Explain why the density of ice is less than water?
6. What are London forces? What is their origin?
7. Arrange the following acids according to their increasing acid strength with suitable    explanation, HOCl, HClO₃, HClO₂, HClO₄.
8. How does HNO₃ behave as a base in concentrated sulphuric acid? Give the chemical equation.
9. How is hydrogen peroxide prepared?
10. Give the reasons for the anomalous properties of oxygen from the rest of the elements.

 

PART – B

 

Answer any eight questions                                 (8 x 5 = 40)

 

11. What is lattice energy? How is it determined for the formation of NaCl using Born Haber’s
12. Calculate the electronegativity of carbon (r_C = 0.71 A^o) following Allred –Rochow method.
13. Explain the types of hydrogen bonding and explain any two of its consequences.
14. Discuss the structure of (a) PCl₅ (b) POF₃ using hybridization theory.
15. Write short notes on (i) p-type & n-type semiconductors
16. What are clathrates? What are their characteristics?
17. What are conjugate acid-base pairs? Give two examples.
18. Explain the role alkali metal in liquid ammonia as solvent.
19. Write a short note on nitrogen fixation.
20. Compare the gradation properties of nitrogen group elements with respect to their oxidation    states, metallic character and electronegativity.
21. Give the preparation, properties and uses of hydrazine
22. How does O₃ react with (a) lead sulphide  (b) potassium iodide

 

 

 

 

 

 

PART – C

 

Answer any four questions                                                 (4 x 10 = 40)

 

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

(b) Explain the structure of the following compounds using VSEPRtheory

(a) ClF₃   (b) ICl₄^–

24. Construct a qualitative MO energy level diagram for O₂ Write the MO electronic    configuration and bond order for O₂, O₂⁺, O₂²⁺ O^2-, O₂^2-molecule
25. How does band theory of metals explain the conducting properties of metals?
26. Explain HSAB theory. Mention any four applications.
27. How are oxides classified? Give examples
28. (a) How are superphosphate and triple super phosphate prepared?

(b) Compare and contrast the properties of O₃ and H₂O₂.

 

 

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