LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

LM 17

SIXTH SEMESTER – APRIL 2006

                                                  CH 6602 – CHEMISTRY OF MATERIALS

(Also equivalent to CHE 602)

 

 

Date & Time : 24-04-2006/9.00-12.00         Dept. No.                                                       Max. : 100 Marks

 

 

Part A

Answer all the questions.                                                                          10×2=20

1. What are Bravais lattices?
2. Differentiate type I and type II semiconductors.
3. What are intrinsic semiconductors? Give an example.
4. What is Curie-Weiss law?
5. What is Meissner effect?
6. Give two examples each of n-type or p-type metal oxide semiconductor.
7. Define piezoelectric ceramics.
8. How is radius ratio rule useful in determining the crystal structure?
9. Define magnetic susceptibility.
10. What is CVD technique?

Part B

Answer any eight questions.                                                                      8×5=40

11. What are liquid crystals? Explain the different types of liquid crystals.
12. How is the structure of compounds determined by powder method?
13. Explain the crystal structure of perovksite with a neat diagram.
14. Mention any five differences between hard and soft magnetic materials.
15. What are ferromagnetic and antiferromagnetic materials? Give examples.
16. How is solar energy harnessed using photovoltaic cells?
17. Describe the technique of crystal growth from solutions.
18. An alkali metal crystallizes in a cubic lattice. The edge of the unit cell is 4.16A^o. The density is 975kg/m3 and its atomic weight is 23. Find the number of atoms in the unit cell and give your comment about the type of cubic cell.
19. Draw and explain the crystal structure of NaCl.
20. Describe the principle and fabrication of a transistor using n-p junction.
21. How are TG and DTA useful in the structural determination of crystals? Give    examples.
22. What is Frenkel defect? Explain with an example.

Part C

Answer any four questions.                                                                     4X10=40

23. What are the types of non-stoichiometric defects? Explain with examples.
24. Draw and explain the structures of wurtzite and zinc blende. Mention the     differences between them.
25. Describe the hydrothermal growth and growth from melt methods for preparing    crystals.
26. Write a note on photoelectrocatalytic splitting and photo reduction of water.
27. Explain BCS theory and Kirkendall effect.
28. a) Mention any four types of Bravais lattices available depending upon the shapes of the unit cells? Explain with suitable examples.
29. b) Explain photo galvanic studies using a heterobinuclear complex.

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc.

AC 11

DEGREE EXAMINATION –CHEMISTRY

SIXTH SEMESTER – APRIL 2007

CH 6602 – CHEMISTRY OF MATERIALS

 

 

Date & Time: 20/04/2007 / 9:00 – 12:00          Dept. No.                                                     Max. : 100 Marks

 

 

Part A

Answer all the questions.                                                                                      10×2=20

1. Calculate the miller indices of crystal planes, which cut through the crystal axis at (3a, b, c).
2. Mention the differences between phosphorescence and fluorescence.
3. State the law of cryatallography.
4. Mention the differences between diamagnetic and paramagnetic materials?
5. Give one example of crystal growth by chemical vapor deposition method.
6. Mention the uses of the following crystals
7. a) Si b) quartz c) GaAs           d) CaF₂
8. Define liquid crystals.
9. An organic compound crystallizes in an orthorhombic system with two molecules per unit cell. The unit cell dimensions are 12.05, 15.05 and 2.69A^o. If the density of the crystal is 1.419g/cm³ , calculate the molar mass of the organic compound.
10. Differentiate anisotropy and isotropy.
11. State Curie-Weiss law.

Part B

Answer any eight questions.                                                                                  8×5=40

11. Explain BCS theory with an example.
12. How is the structure of compounds determined by single crystal X-ray diffraction             method?
13. Explain the process of crystallization by Bridgeman method?
14. Discuss the phenomenon of antiferromagnetism. How does it differ from ferromagnetic materials?
15. Describe the structure of sodium-β-alumina.
16. A paramagnetic material has a magnetic field intensity of 10⁴ A/m. If the susceptibility of the material at room temperature is 3.7 x 10^-3, calculate the magnetization and flux density in the material.
17. Mention the differences between ferroelectric and piezoelectric crystals with examples.
18. Explain the photo reduction of water with an example.
19. What is Schottky defect? Explain with an example.

 

 

 

20. What is Kirkendall effect? Explain.
21. The TG curve of 125.7 mg of sample that contained a mixture of

CaC₂O₄.H₂O (MW 146) and a thermally stable salt exhibited a weight loss of

6.98 mg at a temperature of 140°C corresponding to the loss of water. Determine the percentage of CaC₂O₄.H₂O in the sample.

22. How is flame fusion method helpful for the growth of crystals?

 

Part C

Answer any four questions.                                                                                 4X10=40

23. What are the types of non-stoichiometric defects? Explain with examples.
24. Explain the following:
25. a) Meissner effect b) working principle of sodium-sulphur battery. (5+5)
26. Draw and explain the crystal structure of spinel and inverse spinel with examples.
27. Describe the photolysis of water with an example.
28. Explain the following with examples:
29. a) Cheveral phases
30. b) hard and soft magnets (5+5)
31. a) Name the seven basic crystal systems and fourteen Bravais lattices. Give examples

with their interfacial angles and primitive values.

1. b) What are the types of lattices available depending upon the shape of the unit cell

and calculate the number of atoms per unit cell in each case.                         (6+4)

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

RO 31

SIXTH SEMESTER – APRIL 2008

CH 6602 – CHEMISTRY OF MATERIALS

 

 

 

Date : 23/04/2008                Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

Answer all the questions.                                (10 ´2 = 20)

1. What is primitive cell ?
2. Draw a neat sketch for cubic Zinc sulfide crystal structure.
3. What is known as hydrothermal method.
4. What is the principle of working of scanning electron microscope.
5. How conductivity varies with temperature in
6. Conductors
7. Semiconductors
8. What is photoluminescence?
9. What are Ferrites ?
10. Define Neel temperature.
11. What is isotopic effect in super conductivity ?
12. What are Polarons ?

PART – B

Answer any Eight questions                     (8  ´ 5   = 40)

11. What are Miller Indices ? Explain how Miller indices is determined for a crystal plane.
12. With a neat diagram , explain the NaCl structure.
13. Discuss in detail about Bravais Lattices.
14. How is zone refining technique used to purify the material?
15. Explain the principle of working of thermogravimetric analysis.
16. Explain about point defects in crystalline solids.
17. Discuss in detail about the classification of ferroelectric crystals .
18. Distinguish between dia, para and ferromagnetic materials.
19. Explain the origin of ferromagnetic domains.
20. What is Meissner effect? What are Type – I &  Type – II super conductors.
21. Explain the principle, construction and working of high energy Lithium battery.
22. Discuss about the classification of liquid crystal and give their applications.

PART – C

Answer any four questions.                                 ( 4 ´ 10 = 40 )

23. What is hexagonal closed packed structure? Find the properties of hexagonal closed packed structure.
24. Discuss in detail about the growth of crystal from Czochraski method.
25. a). What are intrinsic and extrinsic semiconductors?

b). Derive an expression for intrinsic carrier concentration.

26. Write short notes on

a).Curie point and the exchange integral.

b).Temperature dependence of saturation magnetization.

c).Saturation magnetization at absolute zero.

27. Explain the occurrence of super conductivity based on Bardeen Cooper and Schrieffer theory.
28. Write short notes on a) Spinel
29. b) Perorakite structures
30. c) High temperature super conductors

 

 

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      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)

9. Cite any two examples for super conducting oxides.
10. What are Polarons?

PART – B

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

 

11. With a neat diagram explain the structure of wurtzite.
12. Discuss the different types of indices used in crystallography.
13. What is hexagonal close packed structure? Explain.
14. Write a note on Czochralski method of crystal growth.
15. Enlist the applications of SEM.
16. Derive an expression for intrinsic carrier concentration.
17. Explain the types of ferroelectric crystals.
18. Discuss curve point and exchange integral.
19. Bringout the differences between ferro and ferri magnetic substances.
20. Discuss Bardeen, Cooper and Schrieffer theory.
21. Listout the applications of superconducting materials.
22. Explain the working of (i)    Sodium-sulphur battery

(ii)    Lithium battery

 

PART – C

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

 

23. Discuss the types and applications of liquid crystals.
24. What is magnetic susceptibility? How is it determined?
25. Explain the types of defects in solid state.
26. Explain the principle and application of TGA and DTA.
27. a) Tabulate the Bravais lattices in crystal systems with examples.
28. b) Write briefly on solar energy conversion. (5+5)
29. Write notes on            any two of the following

• Meissner effect
• X-ray diffraction
• Liquid crystals (5+5)

 

 

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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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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FOURTH SEMESTER – APRIL 2012

CH 4204 – CHEMISTRY FOR BIOLOGISTS – II

 

 

Date : 19-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

 

Part- A

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

1. What is a dipeptide? Give an example.
2. Define isoelectric point of an amino acid
3. Draw the structure of fructose.
4. What are fungicides? Give any two examples.
5. Give the compositions of NPK fertilizers.
6. What are isomerases? Give an example.
7. Give an example for the optical specificity of an enzyme.
8. Define iodine value of a fat.
9. What are PUFA? Give any two examples.
10. Draw the structure of papavarine and citral.

Part – B

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

11. Discuss in detail the primary structure of proteins.
12. Give any two methods of synthesis of amino acids.
13. How will you convert a hexose into  pentose?

1. Give a brief over view of Citric acid cycle.

15. What are fertilizers? List the importance of the fertilizers.
16. How are the following synthesized?

(a) 2,4-D          (b) 2,4,5-T

17. Explain the process of transcription in brief.

1. What are coenzymes? Explain the significance of coenzymes in enzyme action.
2. Mention the difference between plant and animal fats.
3. Define rancidity of a fat? What are the two types of rancidity? Explain.
4. What are lecithins and cephalins? Explain.
5. Explain the factors affecting the enzymatic activity.

 

 

Part-C

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

23. Discuss the classification of proteins based on their function.
24. Describe in detail the different types of soil
25. List the uses of insecticides. Give the method of synthesis of the following
26. a) DDT b)   BHC    c)  Organophosphates                                    (3+4+3)
27. What is enzyme inhibition? Discuss competitive and non-competitive inhibitions with examples.
28. a.) Explain the classification of lipids with examples.

b.) Discuss the classification of alkaloids.

28. Draw and explain the double helical structure of DNA.

 

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