GH 42

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – APRIL 2008

CH 3900 – INSTRUMENTAL ANALYSIS (FOR PHYSICS)

 

 

 

Date : 05-05-08                  Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART-A

 

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

1. How will you prepare a standard solution of 0.1 N K₂Cr₂O₇

(Molecular mass = 294) in 250 ml water?

1. Calculate the pH of a solution obtained by mixing 500 ml of 0.05M NaOH with 500 ml of 0.1 M HCl?
2. What is bathochromic shift? Give an example.
3. Calculate the solubility of AgCl_(s) in 0.01M NaCl solution

(K_sp of AgCl is 1×10^-10).

1. What is Nerst glower?
2. List the factors affecting DTA curves.
3. What are the characteristics of a primary standard? Give an example.
4. What are mobile and immobile phases in TLC?
5. What are the significance of
6. Define value. What are its significances?

 

PART-B

 

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

1. Derive Beer-Lambert’s law. Explain.
2. Explain the principle involved in the fractional distillation.
3. Explain the thermogram of calcium acetate monohydrate.
4. How is a mixture of halides separate by ion-exchange chromatography?
5. What are the uses of TGA and DTA Distinguish between them.
6. Discuss the principle involved in Flame photometry.
7. How would you separate the following

• o – nitrophenol and p-nitrophenol
• naphthalene and benzoic acid

1. Explain the working of a gas chromatograph with an example.
2. How would you determine the pH of an acid using potentiometer?
3. How will you separate aminoacids using paper chromatography?
4. Explain the uses of soxhlet extractor.
5. Write notes on (a) Molar absorptivity             (b) Diverse ion effect.

 

PART-C

 

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

1. Explain the principle, instrumentation and working of gas chromatograph.
2. Explain the thermogram of

• CaC₂O₄. H₂O
• CuSO₄.5H₂O

with neat diagrams.

1. a) What are buffer solutions?

Explain the buffer action.

1. b) Calculate the pH of a solution containing 500ml of 0.01M NH₄OH and 500ml of 0.002M NH₄ (K_b for NH₄OH is 1.8×10^-5)

1. Write a note on UV-Visible spectro photometer. Explain its function and applications.
2. a) Explain the principle involved in absorption chromatography.

1. b) What are the importances of thermometric titrations?

1. a) Explain the principle involved in AAS. Mention the uses of AAS.

1. b) How would you determine the structure of an organic compound derived from plants?

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

DB 30

M.Sc. DEGREE EXAMINATION – PHYSICS

THIRD SEMESTER – November 2008

    CH 3900 – INSTRUMENTAL ANALYSIS

 

 

 

Date : 14-11-08                 Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

Answer All the questions                                                                                                      (10 x 2=20)

1. Is NaOH a primary standard substance? Justify your answer.
2. What is meant by diverse ion effect?
3. Define ionic product of water.
4. List out the advantages of using organic precipitants in gravimetric analysis.
5. How will you separate an organic mixture by solvent extraction method?
6. What are cation exchange resins? Give an example.
7. How will you calculate the stretching vibrational frequency of a bond?
8. What is atomic fluorescence spectroscopy?
9. How DTA is differentiated from TGA?
10. What is the basic principle of DSC and mention the reference material used in it?

 

PART – B

Answer any EIGHT questions                                                                                             (8×5=40)

 

11. (i) Define ppm and ppb. (ii) Calculate the amount of H₂SO₄  in 100ml of N/5 H₂SO
12. How pH is determined using pH meter.
13. Calculate the pH of a solution obtained by mixing 5g of acetic acid and 7.5g of sodium acetate and making the volume equal to 500 ml?(Ka of acetic acid is 1.75×10^-5)
14. Describe the technique of recrystallisation.
15. Explain the difference between adsorption and partition chromatography.
16. How a mixture of amino acid can be separated by paper chromatography.
17. Discuss the distillation under reduced pressure with an example.
18. Draw the block diagram for double beam spectrophotometer. What are the functions of the components?
19. Describe the characteristics absorption bands for the following functional groups.

           (i) Aldehydes (ii) Alcohols (iii) Substituted benzenes (iv) primary amine  (v) Alkenes

20. Describe the principle of flame emission photometry
21. Discuss the factors affecting DTA curves.
22. What are thermometric titrations? Describe how hydrochloric acid is estimated using thermometric titrations.

PART – C

Answer any FOUR questions                                                                                              (4×10=40)

23. (i) Explain the action of resins in ion exchange chromatography.                                           

        (ii)  How vitamins are separated by TLC?.                                                                                  

24. Discuss the principle of the following methods.

                (i) Distillation (ii) Fractional Distillation (iii) steam distillation.

25. (i) Explain the determination of solubility of a sparingly soluble salt.

               (ii) How is pHdetermined using potentiometer?

26. (i) Give the theory of azeotropic distillation.

(ii) Sketch and label the various stretching and bending vibrations of a triatomic molecule.

27. (i) Derive Beer- Lambert’s Law and explain the reasons for the deviations of the Law (7)

(ii) What are the advantages of AAS over Flame emission spectroscopy?                           (3)

28. (i) Give an account of the applications of TGA.

         (ii) Draw and explain the TGA curve expected for the following.

(i) AgNO₃                       (ii) CuSO₄.5H₂O

 

 

 

 

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