LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – NOVEMBER 2012

CH 1506/CH 1503/CH1500 – BASIC CONCEPTS IN INORGANIC CHEMISTRY

 

 

Date : 10/11/2012             Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

 

PART A

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

 

1. State the modern periodic law.
2. Define Hund’s rule of maximum multiplicity.
3. Explain the enthalpy of solutions.
4. Mention any two important properties of ionic compounds.
5. Draw the electron dot structure of Nacl and NH₃.
6. State octet rule.
7. What are semiconductors? Give an example
8. H₂O is a liquid while H₂S is a gas at 298k . Give reason and explain.
9. Give one example for a double decomposition reaction.
10. What are protonic and aprotic solvents?

 

PART B

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

 

11. Discuss the horizontal and vertical relationship in periodic table.
12. What is pauli’s exclusion principle and Heisenberg uncertainty principle?
13. Mention the factors that affect lattice energy.
14. State and explain fajan’s rule.
15. Explain the different types of molecular orbitals.
16. State Sidwick- Powel theory and explain its role in the prediction of molecular shapes.
17. Write a note on london dispersive forces and van der waal’s forces.
18. Explain Bohr’s
19. Define hydrates and clathrates.  How are they formed?  Give example.
20. State and explain Arrhenius theory.
21. Discuss the role of liquid ammonia as a solvent.
22. Explain inter and intra molecular hydrogen bonding and their consequences.

 

 

 

 

 

PART C

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

 

23. Explain the trend in electronegativity and ionisation potential along a period.
24. (a) Write the Born Lande equation and mention the significance of the terms involved.

(b) using Born–Haber cycle, arrive at the lattice energy for sodium chloride.

25. State VSEPR theory, explain the geometry of the following compounds
26. a)  NH₃                              b) SF₄                   c) ICl₄^–                d) XeF₆
27. Explain band theory of metals.
28. Write short notes on any three of the following:

(a) Symbiosis

(b) Bronsted–Lowry theory of acids and bases.

(c) Lewis theory

(d) Lux–flood theory

(e) Clsanovich concept

28.   Explain the following:

(a) Inert pair effect

(b) Avogadro principle

(c) Hybridisation

(d) n–p   Junction

(e) Pearson principle.

 

 

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