LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

SIXTH SEMESTER – APRIL 2011

CH 6608/CH 6602 – CHEMISTRY OF MATERIALS

 

 

 

Date : 09-04-2011              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART –A

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

 

1. Represent (111) and (110) plane of a simple cubic crystal.
2. What is CVD?
3. Give the classification of liquid crystals.
4. Give an application each for TGA and DTA.
5. What is SEM analysis?
6. State Curie –Weiss law.
7. Predict the coordination number for the following cation and anion Na⁺( 0.95A⁰ ) and Cl^–(1.81 A⁰)
8. What are semiconductors? Give an example.
9. Distinguish between ferro and ferri magnetic properties.
10. Identify the following complexes as diamagnetic and paramagnetic.

1. [NiCl₄]^2- b. [Fe (CN)₆]^3-

 

PART –B

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

 

1. Explain the structure of NaCl.
2. With a neat diagram explain the wurzite structure.
3. Give the radius ratio rules. How is it used to determine the coordination number? Explain with an example.
4. Write a note on Sol gel and hydrothermal method of crystal growth.
5. Explain photoluminescence with an example.
6. What are n and p type semiconductors? Explain with suitable example.
7. Explain the following:

1. piezoelectric     pyro-electric        c. ferroelctrics

 

1. MgFe₂O₄ is a normal spinel whereas NiFe₂O₄ is an inverse spinel. Explain.
2. Explain the working of lithium battery.
3. Discuss Bardeen, Cooper and Schrieffer theory.
4. Enlist the applications of     i. SEM           ii. organic semiconductors.
5. Explain the function of photogalvanic cell.

 

PART –C

 

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

 

1. What is magnetic susceptibility? How is it determined?
2. Write a note on Schottky and Frenkel defects in crystals.
3. Explain the principle and applications of TGA and   DTA.
4. Discuss the types and applications of liquid crystals.
5. Define Bravais lattices. Explain with examples.
6. Write briefly on the following:

1. Meissner effect. X-ray diffraction.

 

 

 

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