LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – PHYSICS

AD 26

THIRD SEMESTER – NOV 2006

CH 3900 – INSTRUMENTAL ANALYSIS (FOR PHYSICS)

 

 

Date & Time : 03-11-2006/9.00-12.00     Dept. No.                                                    Max. : 100 Marks

 

 

PART – A

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

 

1. A sample of well water is found to contain 0.5000 g CaCO₃ in 1 kg water sample.  Find out the concentration of calcium in mg mL^-1.
2. What is the pH of a solution containing 400 mg NaOH in 100 mL H₂O.
3. Explain red shift with an example.
4. Mention the cell and detector used in IR spectroscopy.
5. Compare the solubility of Agcl_(s) in (i) pure H₂O  (ii) 0.1 M aq. KCl and (iii) 0.1 m aq. KNO₃.
6. Mention factors which influence the quality of crystals obtained during recrystallization.
7. How is adsorption different from absorption?
8. What is retention factor in chromatography?  What is its significance?
9. Why is low pressure distillation used to purify some compounds?
10. Give the general principles of thermal analytical techniques.

 

PART – B

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

 

1. How is 1.0000 m HCl prepared from con. HCl?
2. Drive Beer Lambert’s law.  How is it verified?
3. Explain the principle of flame photometry.
4. Determine the solubility of lead iodide in 0.0100 m aq. Pb(NO₃)₂ . K_sp of pbI₂ is 1 ´ 10^-10 mol³ dm^-9.
5. A solution containing 8.75 ppm KMnO₄ has a transmittance of 0.743 in a 1 cm cell at 520 nm.  Calculate the molar absorptivity of KMnO₄.
6. What is the molarity of commercial H₂SO₄, containing 98% by weight with specific gravity 1.84 g mL^-1.
7. What is fractional distillation?  What are its advantages and limitations?
8. Explain mobile phase, immobile phase, eluent and detection of compounds in paper chromatography.
9. How is column for column chromatography prepared?  What are substances generally used to prepare these columns?
10. How are compounds extracted from parts of plants?
11. Discuss factors affecting DTA curves.
12. Write notes on (i) sublimation (ii) thermometric titrations.

 

PART – C

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

 

1. How is the pH of a solution determined using potentiometer?
2. Draw the flow sheet diagram of UV-visible double beam spectrophotometer and explain the function of the components.
3. (a) Draw the thermogram of CaC₂O_4.H₂O_(s) and explain.

(b) Explain the factors affecting thermogram.

1. Explain steam distillation taking isomers of nitrophenol as examples.
2. Write an essay on ion-exchange chromatography and its applications.
3. Write notes on:

(i)  Molarity and Normality

(ii) Common ion effect

(iii)Thermal Conductivity Detector                                                                (3 + 3 + 4)

 

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