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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