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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