LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – NOVEMBER 2010

CH 1502 – ANALYTICAL CHEMISTRY

 

 

 

Date : 10-11-10                     Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

 

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

 

1. What first aid will you do if a student spills phenol in his hands?
2. Write answers on the basis of significant figures for the following:
3. a) 7  +  0.08  +  2.9
4. b) 20  X  127/10.8
5. Name the types of adsorbents used in chromatography.
6. Define R_f.
7. Can we use phenolphthalein as indicator for the titration of Na₂CO₃ against HCl?
8. Define the term normality.
9. Mention the factors that influence precipitation.
10. What are complexometric titrations? Give one example.
11. Mention any two applications of TGA.
12. What do you understand by the term ‘reaction interval’ in thermal analysis?

 

PART – B

 

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

 

11. List out the differences between accuracy and precision.
12. What are the advantages of a single pan balance over a double pan balance?
13. When is distillation done under reduced pressure? Draw a sketch of a distillation set.
14. Describe ‘hot filtration’ and give its significance.
15. Write a note on gas chromatography.
16. What are the conditions for a good primary standard?
17. Find out the solubility product of silver chloride. Its solubility in water is

9.6 X 10^-9 mol dm^-3.

18. Calculate the pH of a buffer solution containing 0.2M of acetic acid and 0.02 M of

sodium acetate. (Ka of acetic acid = 1.8 X 10^-5 at 25^oC)

19. Discuss one theory of acid-base indicators.
20. Explain adsorption indicators. Give examples.
21. Explain homogenous precipitation with an example.
22. Explain the thermal analysis of Ca(COO)₂.H₂O.

 

PART – C

 

Answer ANY FOUR questions.                                                                                   (4 x 10 = 40 marks)

 

23. a) Write a detailed outline about the types of errors.                         (5)

 

1. b) Find out the (i) mean (ii) median and  (iii) standard deviation for the

following data :  20.2, 19.3, 19.9, 21.5, 20.7.                                                                     (5)

 

24. a) Explain the Principle and applications of column chromatography.             (5)

 

1. b) Write briefly on ion exchange chromatography. (5)

 

25. a) When is Soxhlet extraction resorted to? Explain its principle with a diagram. (5)

 

1. b) Derive Henderson  equation for an acid buffer and mention its applications.                       (5)

 

26. a) How is Chloride ion in a solution estimated? (any one method)                         (5)

 

1.       b) Explain post precipitation.                                                                                                   (5)

 

27. a) Explain Von Weiman ratio.                         (5)

 

1.       b) What are the characteristics of metal-ion indicator?  Give an example.                      (5)

 

28. a) Discuss on the various components for the instrumentation of DTGA. (5)

 

1.       b)  Explain the factors that influence a thermogram.