LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

GH 1

FIRST SEMESTER – APRIL 2008

CH 1500 – INORGANIC CHEMISTRY – I

 

 

 

Date : 03/05/2008                Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

                                                                        (10 x 2 = 20 marks)

Answer ALL the questions.

1. What is the relationship between ionization potential of the element and election affinity of an element in formation of an ionic bond between the elements?
2. Is it possible to have anion, Why?
3. What is the shape of ClF₃? Draw the structure.
4. He₂ does not exist. Why?
5. What are clathrates? Give example.
6. The boiling point of HCl is –85.0⁰C while that of HF is + 19.4⁰C. Explain.
7. Label as Acid or Base: Cl^–, BF₃, Ag⁺, AlCl₃.
8. What are aprotic solvents? Give two examples.
9. How do you prepare pernitric acid? Write its structure.
10. What is oleum? How is it prepared?

PART – B

                                                                        (8 x 5 = 40 marks)

Answer any EIGHT questions.

1. Define lattice energy? Explain the factors which affect lattice energy.
2. Discuss the relationship between electronegativity difference and partial covalent character of an ionic compound. What is its effect in molecules?
3. Describe the hybridizations involved and structure of (a) BeF₂         (b) PCl₅
4. Draw MO energy lavel diagram for NO molecule. Calculate the bond order in NC.
5. State VSEPR theory. Explain the structure of ICl₄ using VSEPR theory.
6. Write a note on van der Waal’s forces.
7. What are different types of Hydrogen bonding? Explain their influence on the properties of compounds with proper examples.
8. Explain the Solvent-System concept of an acid and a base. What are its limitations?
9. Discuss any four types of reactions using liquid ammonia as a solvent.
10. How do you prepare (a) N₂O₃    (b) Hyponitrous acid. Discuss their structure.
11. How do you prepare Marshall’s acid from Sulphuric acid? Draw its structure.
12. Give an comparitive account of the hydrides and halides of Nitrogen group elements.

PART – C

                                    (4 x 10 = 40 marks)

Answer any FOUR questions.

1. (a)  For HCl molecule the internuclear distance is 127 pm; actual dipole moment

is 3.44 x 10^-30 coulomb meter. Calculate the percent ionic character of HCl.(5)

(b) How do you determine the lattice energy of an ionic compound using Bon-Haber cycle?    (5)

1. (a)  Draw MO energy level diagram of CO molecule. Calculate the bond order (5)

(b)  Using VSEPR theory, describe the structure of (i) SF₆ (ii) XeF₆                  (5)

1. (a)  Of the species O₂, O₂⁺, O₂^– and O₂^2-, which will have maximum bond strength? Explain. (5)

 

(b) What is the action of heat on

(i) Phosphorus acid        (ii) orthophosphoric acid

(iii) metaphosphoric acid                                                                 (5)

1. (a)  What is band theory of a metal?                                                                    (2)

(b)  How does band theory explain the property of a metal, semiconductor and insulator?                                                                                                                                           (8)

1. (a) Explain conjugate acid – base concept with two examples                            (5)

(b) Write a note on hard and soft acids and basis.

1. (a) Write a note on nitrogen fixation.                                                                  (4)

(b) Complete the following with balanced equation.                                          (6)

• Sulphuric acid + Phosphorus pentachloride ®?

(ii) Potassium persulphate + Con. Sulphuric acid®?

(iii) Zinc + dil. nitric acid®?

 

 

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