LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – APRIL 2011

CH 1502/CH 5501 – ANALYTICAL CHEMISTRY

 

 

 

Date : 19-04-2011              Dept. No.                                                    Max. : 100 Marks

Time : 9:00 – 12:00

 

PART -A

Answer ALL the questions                                                                                          (10 x2 =20 marks)

 

1. Give the threshold limits of vapor concentration of mercury and formaldehyde.
2. How is ether handled in the laboratory?
3. A titration is repeated four times and the titre values are 10.1, 9.9, 10.0 and              10.2 ml. calculate the mean.
4. How is benzoic acid recrystallised?
5. What is R_f value?
6. Calculate the molarity when you dissolve 4.9 g of K₂Cr₂O₇ in 1000 ml of water.
7. Mention two adsorbents used in Column chromatography.
8. Mention any two indications used in the titration of a strong acid against a strong base?
9. What are adsorption indicators? Give an example.
10. Define co-precipitation.

PART – B

 

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

 

1. Describe the calibration of a pipette and standard flask.
2. Analysis of a sample of iron ore gave the following percentage values for the iron content 7.08,7.21.7.12,7.09,7.16, 7.14,7.07,7.14,7.18,7.11.Calculate the mean, standard deviation and coefficient of variation for the values.
3. Explain, briefly, the various steps involved in fractional distillation.
4. Discuss the preparation of chromatogram in Thin Layer chromatography.
5. What are the criteria for a primary standard? Give an example for primary and secondary standard.
6. Explain the principle of complexiometric titration with a suitable example.
7. Discuss the factors affecting solubility of precipitates.
8. Sketch the thermogram of calcium oxalate monohydrate.  Discuss the thermo gravimetric analysis technique.

 

 

1. Write briefly on ion-exchange chromatography.
2. What is normal error analysis curve? Give its significance.
3. Calculate the pH and the [H⁺] and [OH^–] concentrations of a 0.005 M solution of Ba (OH) ₂ in water at 25⁰C.
4. Calculate the molar solubility of Ag₂CrO₄ in water at 25⁰C at K_sp =9 x 10^-12.

 

PART – C

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

 

1. Discuss the principle, experimental technique and instrumentation technique of Gas chromatography.
2. Explain in detail the types of errors.
3. Write briefly on a. Sublimation    b. Factors affecting R_f value.
4. Discuss the theory of acid- base indicators with suitable examples.
5. How is chloride determined by Volhard’s method?
6. a. Discuss the factors affecting TG and DTA thermograms.

1. Mention any three requisites of a good wash liquid in gravimeric analysis.

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – APRIL 2012

CH 1502/CH 5501 – ANALYTICAL CHEMISTRY

 

 

 

Date : 28-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

 

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

 

1. Distinguish accuracy from precision.
2. Mention any two filtration techniques.
3. Name two drying agents.
4. Under what conditions distillation under reduced pressure is necessary?
5. Give any two advantages of thin layer chromatography over paper chromatography.
6. What is a buffer solution? Give an example.
7. Write two limitations of volumetric analysis.
8. Define solubility product.
9. Sketch the expected thermogram of calcium oxalate monohydrate in TGA.
10. What is gravimetric factor?

PART – B

 

Answer any EIGHT questions:                                                                                       (8X5=40)

 

11. Write the differences between co-precipitation and post-precipitation
12. How will you calibrate pipette and burette?
13. Find the number of significant figures in the following

(a)6.023X10²³  (b) 0.112  (c) 423.6            (d) 3.1X10¹⁰   (e) 0.00014

14. What are the first – aid procedures to be followed in the laboratory
15. Give the common methods employed to test the purity of the compound
16. Discuss the applications of R_f value.
17. Explain the precautions to be carried out during preparing a column.
18. Enlist the requirements for a good primary standard.
19. Methyl orange cannot be used for all acid-base titrations. Why?
20. Give the applications of adsorption indicators.
21. Discuss the factors that affect solubility.
22. Sketch the block diagram of DTA apparatus.

 

 

PART – C

 

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

 

23. a) Discuss the factors that affect the thermogram.

 

1. b) Write the inferences that could be drawn from DTA.

 

24. Explain: a) Volhard’s method

 

1. b) Von Weiman ratio.

 

25. a) Deduce an expression connecting solubility and K_sp for Ag₂CrO₄.

 

1. b) What are metal ion indicators?

 

26. a) Write the significance of Henderson equations.

 

1. b) Give the definitions of (i) Normality          (ii) Formality             (iii) ppm      (iv) millimole.

 

27. Discuss the principle and applications of a) ion exchange chromatography
28. b) gas chromatography.

 

28. a) Explain the types of errors. (6)
29. b) Mention methods of minimizing errors. (4)

 

 

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – NOVEMBER 2012

CH 1505/1502/5501 – ANALYTICAL CHEMISTRY

 

 

 

Date : 08/11/2012             Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART –A

 

Answer ALL the questions:                                                                                     (10 x2 =20 marks)

 

1. Mention the antidote for CO and Pb²⁺ poisoning.
2. List the number of significant figures in the following numbers
3. i) 0.216 ii) 90.7
4. Give the advantages of TLC.
5. Define Sublimation.
6. What are primary standards? Give an example.
7. How many milliliters of 0.25 M solution of H₂SO₄ will react with 10 mL of 0.25 M solution of

NaOH?

7. What are adsorption indicators?
8. Define post precipitation.
9. What quantity is measured in TGA and in DTA?
10. Mention any two applications of TGA.

PART –B

 

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

 

11. Calculate the mean and the standard deviation of the following set of analytical results:

15.67, 15.69 and 16.03g

12. How are poisonous chemicals stored in the laboratory?
13. Discuss the principle and applications of Paper chromatography.
14. How is the purity of a compound tested?
15. Discuss the different titrimetric methods.
16. Give the preparation of acid-base buffers.
17. Discuss the principle of Steam distillation.
18. Calculate the pH and pOH of a 1.00 x 10^-3M solution of acetic acid.
19. Explain the principle of complexiometric titration with a suitable example.
20. Sketch the thermogram of calcium oxalate monohydrate. Discuss the Thermo gravimetric

analysis technique.

21. Calculate the molar solubility of PbSO₄ if the solubility product is 1.6 x 10 ^-8.
22. What is von Weiman ratio? Define the terms in it.

 

PART -C

 

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

 

23. Discuss the theory of acid- base indicators with suitable examples.
24. How is chloride determined by Volhard’s method?
25. What are absolute and relative errors? Give the methods of minimizing errors.
26. Explain the principle, technique and applications of ion-exchange chromatography.
27. Discuss the instrumentation of thermogravimetric analysis.
28. a) Give the properties and uses of drying agents.
29. b) What are metal ion indicators? Explain their characteristics.

 

 

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