LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – PHYSICS

WD 44

THIRD SEMESTER – April 2009

CH 3900 – INSTRUMENTAL ANALYSIS (FOR PHYSICS)

 

 

 

Date & Time: 29/04/2009 / 9:00 – 12:00  Dept. No.                                                 Max. : 100 Marks

 

 

 

PART-A

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

 

1. Calculate the molarity of a solution which contains 6 g of NaOH (M.W.= 58.44) in

200mL of  solution?

2. What are the conditions involved in good fractionation?
3. What is the effect of temperature on HPLC?
4. Write the types of ion exchange resins with an example?
5. Define solubility product?
6. Calculate the pH and pOH of a 0.01 M solution of NaOH at 25 °C?
7. Calculate the frequency of C-H stretching vibration from the following data.

k = 5×10⁵ dyne cm^-1   and     m = 1.532×10^-24g.

8. Distinguish between AAS and FES.
9. What is the principle DSC. Mention the reference material used in it.
10. Compare DTA and TGA.

 

PART-B

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

 

11.a) What are primary and secondary standard solutions?

1. b) Mention the prerequisites for secondary standard.
2. Explain the method of purifying the mixture of solvents by steam distillation.
3. How can a mixture of ethanol and water be separated by azeotropic distillation?
4. How TLC is superior to other chromatographic techniques?
5. Explain the difference between adsorption and partition chromatography?
6. How is solubility determined using potentiometer?
7. A buffer solution contains0.20 mole of NH₄OH and 0.5 mole of NH₄Cl per litre.

Calculate the pH of the solution (K_b of NH₄OH at 25 °C is 1.81 X 10^-5)

18. Discuss the principle involved in flame photometry.
19. Write a short note on finger print region.
20. Describe the main parts of double beam spectrophotometer and give the function of

each component.

21. Explain the factors which affect DTA curves.
22. Discuss the applications of TGA.

 

PART-C

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

 

23.. a) Explain the principles involved in the following.(5)

(i) Column chromatography  (ii) Paper chromatography

1. b) Define R_f What are the factors affecting it? (5)
2. a) How can a mixture of aminoacid be separated by paper chromatography? (5)
3. b) Explain the detectors used in ion exchange chromatography? (5)
4. a) Derive Henderson equation to determine the p^H of a buffer solution.(6)
5. b) Write the principle of thermometric titrations.How is it applied for the titratiuon between a strong acid and strong base.(4)
6. Draw and explain the thermograms expected for the following.(5+5)

(i) CuSO₄.5H₂O   (ii) CaC₂O₄.H₂O

27. a) Briefly describe the two basic types of vibrational modes of triatomic molecule. (7)
28. b) How does lead in petrol determined using AAS?
29. Derive Beer-Lasmbert’s law. How can it be verified?

 

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