“Loyola College B.Sc. Chemistry April 2009 Chemistry Of Materials Question Paper PDF Download”

      LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

WD 21

SIXTH SEMESTER – April 2009

CH 6608 / 6602 – CHEMISTRY OF MATERIALS

 

 

 

Date & Time: 23/04/2009 / 9:00 – 12:00     Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

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

 

  1. Define coordination number in ionic crystals.
  2. Sketch the unit of fcc and bcc structures.
  3. What is CVD?
  4. Give any two types of thermograms in TGA.
  5. With an example, explain photoluminescence.
  6. Mention any two organic semiconductors.
  7. What is Curie temperature?
  8. Indicate the following as diamagnetic or paramagnetic and give reason.
  • (ii)
  1. Cite any two examples for super conducting oxides.
  2. What are Polarons?

PART – B

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

 

  1. With a neat diagram explain the structure of wurtzite.
  2. Discuss the different types of indices used in crystallography.
  3. What is hexagonal close packed structure? Explain.
  4. Write a note on Czochralski method of crystal growth.
  5. Enlist the applications of SEM.
  6. Derive an expression for intrinsic carrier concentration.
  7. Explain the types of ferroelectric crystals.
  8. Discuss curve point and exchange integral.
  9. Bringout the differences between ferro and ferri magnetic substances.
  10. Discuss Bardeen, Cooper and Schrieffer theory.
  11. Listout the applications of superconducting materials.
  12. Explain the working of (i)    Sodium-sulphur battery

(ii)    Lithium battery

 

PART – C

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

 

  1. Discuss the types and applications of liquid crystals.
  2. What is magnetic susceptibility? How is it determined?
  3. Explain the types of defects in solid state.
  4. Explain the principle and application of TGA and DTA.
  5. a) Tabulate the Bravais lattices in crystal systems with examples.
  6. b) Write briefly on solar energy conversion. (5+5)
  7. Write notes on            any two of the following
  • Meissner effect
  • X-ray diffraction
  • Liquid crystals (5+5)

 

 

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