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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