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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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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        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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