LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

           B.Sc. DEGREE EXAMINATION – CHEMISTRY

GH 19

FIFTH SEMESTER – APRIL 2008

CH 5501 – ANALYTICAL CHEMISTRY

 

 

 

Date : 30-04-08                  Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

Answer the following:                                                                       (10×2=20)

1. Distinguish between ‘precision’ and ‘accuracy’ of analytical data.
2. What are antidotes? Cite two examples.
3. What are drying agents? Cite two examples
4. What are R_f values? Mention their significance.
5. Define the term Normality.
6. What are redox indicators? Give two examples.
7. What is solubility product? What is its application?
8. Define the term peptization.
9. State the Beer-Lamberts law. Give its use.
10. What is the wave number corresponding to 10.

 

PART – B

Answer any EIGHT of the following:                                             (8×5=40)

1. How are pipettes and standard flasks Calibrated?
2. Explain the types of error. Give the methods of minimising them.
3. Explain the chemical methods of purification and test of purity.
4. Explain the principle and procedure for Ion-exchange chromatography.
5. Derive the Henderson’s equation.
6. Explain the primary and secondary standards.
7. Explain how Erio-chrome black.T functions as an indicator in EDTA titrations.
8. The solubility product of AgCl at 25⁰C is 1.78 x 10^-10. Calculate its solubility in morality.
9. Distinguish between co precipitation and post precipitation.
10. Explain the following: (a) Line width in a spectrum. (b) Auxochromes.
11. What are selection Rules? Give them for electonic (Uv-vis) spectorscopy.
12. Describe the types of vibrational modes of a non-linear triatomic molecule.

 

PART – C

Answer any FOUR of the following:                                              (4×10=40)

1. How is Standard Deviation calculated for a set of analytical data.
2. Discuss on the principle and experimental techniques of Fractional distillation.
3. (a) Explain the principle and preparation of TLC.

(b) How will you determine the relative strength of acids from K_a values.

1. (a) Explain the various types of titrations?

(b) Explain the use of phenolphthalein and methyl orange as indicator.

1. Write notes on:

(i) Sequestering agent             (iii) Nucleation

(ii) Common – ion effect        (iv) Homogenous precipitation

1. Discuss on the functional group analysis in IR spectroscopy.

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

GH 2

FIRST SEMESTER – APRIL 2008

CH 1502 – ANALYTICAL CHEMISTRY

 

 

 

Date : 03/05/2008                Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

                                                                        (10 x 2 = 20 marks)

Answer ALL questions.

1. The metal content in a mineral was reported as 30%. Taking the acceptable value as 32%, calculate the absolute error and relative error in ppt.
2. What first aid should be given for spillage of concentrated acid and strong alkali on a person?
3. Differentiate between eluent and eluate.
4. What is the difference between direct titration and a back titration?
5. Why would a reprecipitation be employed in a gravimetric analysis?
6. What quantity is measured in TGA and in DTA?
7.  What are the advantages of DTA over TGA?
8. What are metallochromic indicators? Give an example.
9. What is a secondary standard? Mention its properties.
10. Compare the solubility of lead iodide in

1. i) pure water ii) 0.1 M aq KNO₃ and iii) 0.1 M aq KI.

 

PART – B

                                                                        (8 x 5 = 40 marks)

Answer any EIGHT questions.

1. What are the general rules observed in the storage and handling of chemicals?
2. How is a burette calibrated?
3. What are the possible errors in weighing? How can they be minimized?
4. Explain the principle of solvent extraction and extraction using a second solvent.
5. Discuss the principle of distillation under reduced pressure.
6. Explain the principle behind the separation of a mixture using paper chromatography.
7. A sample of pure sodium carbonate weighing 0.3542g is dissolved in water and titrated with a solution of hydrochloric acid. A volume of 30.23 mL is required to reach the methyl orange end point. Calculate the normality of the acid solution.
8. How is selection of proper indicator effected in acid-base titrations?
9. What characteristics should a substance possess to be used as a primary standard for acid or base solutions?
10. Explain the terms coprecipitation and post precipitation. Differentiate between them.
11. Discuss the factors that affect the size of particles of precipitate in gravimetric analysis.
12. Write briefly on the factors that affect the thermogram.

 

PART – C

                                    (4 x 10 = 40 marks)

Answer any FOUR questions.

1. The normality of a solution is determined by four separate titrations, the results being 0.2041, 0.2049, 0.2039 and 0.2043. Calculate the mean, median, range, average deviation and standard deviation and coefficient of variation.
2. a) Discuss the principle and applications of GC.                                            (5)

1. b) Explain the functioning of FID in GC. (5)

1.  Explain the principle and methodology behind the separation of ions using

ion exchange chromatography.

1. a) List out the reasons for the versatility of EDTA as titrant.                                    (3)

1. b) Explain how EDTA is used in direct, back and indirect titration methods.(7)

1. a) How is chloride determined by Volhard method?                                     (6)

1. b) What are adsorption indicators? Explain (4)

1. Using a block diagram, discuss the various components of TGA and DTA apparatus.                                                                                                                                             (5+5)

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

DB 18

FIFTH SEMESTER – November 2008

CH 5501 – ANALYTICAL CHEMISTRY

 

 

 

Date : 05-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

 

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

 

1. What will you do as first when phenol spilts on the hands.
2. How many significant figures are there in a) 0.10000 b) 6.023X10²³.
3. When is distillation under pressure carried out?  Give an example.
4. Write down two applications of R_f values.
5. Distinguish between formality and normality.
6. Can we use methyl orange indicator in the titration of NaOH against HCl?  Justify.
7. What are adsorption indicators?  Write an experiment where it is used.
8. Calculate the energy of an electromagnetic radiation of wave length 663 pm.
9. Sketch the vibrational modes of H₂O and label each as IR active or inactive.
10. Enlist the factors affecting solubility.

 

PART – B

 

Answer any EIGHT of the following                                                                        (8 x 5 = 40 marks)

 

1. Draw the block diagram of single pan balance and label the components.
2. Give the differences between precision and accuracy.
3. Write a note on Soxhelet extraction.
4. What are the types of resins used in ion exchange chromatography.  Give examples and applications.
5. Calculate the pH of a buffer solution containing 0.1 M of acetic acid and 0.01 M of sodium acetate.  (Ka of acetic acid = 1.8X10^-5 at 25^oC).
6. Write a note on theories of indicators.
7. Distinguish between co-precipitation and post-precipitation.
8. Discuss the principle of titration using EDTA.
9. How would you prepare 100 mL of N HCl from i) concentrated HCl (11N)

1. ii) a solution of 2 N HCl

1. What are chromophores and auxochromes?  Cite examples.
2. Write Beer Lambert’s law.  What are its limitations?
3. How will you distinguish different types of hydrogen bonding by IR spectroscopy?

 

 

 

 

PART – C

Answer any FOUR of the following                                                                                     (4 x 10 = 40 marks)

 

1. a) Name the various types of errors in chemical analysis.                                                       (4)

1. b) Find out the (i) mean (ii) median and (iii) mean deviation for the following data: 0.1010,

0.1020, 0.1005, 0.1030, 0.1015.                                                                                         (6)

 

 

24. a) Write about (i) Bathochromic shift; (ii) hypsochromicshift; (iii) hyperchromic shift
25. b) What are the types of electronic transitions?                                                                       (6+4)

 

25. a) List out the requirements of a primary standard?
26. b) Describe Volhard’s method of chloride estimation. (5+5)

 

26. a) What are the tests of purity?
27. b) Compare thin layer chromatography with column chromatography. (5+5)

 

27. Discuss different types of titrations with an example for each type.

 

28. Distinguish between             a) end point and equivalence point            b) stationary phase and mobile phase
29. c) Symmetric stretching and asymmetric stretching                         (3+3+4)

 

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