LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

AD 02

FIRST SEMESTER – NOV 2006

CH 1502 – ANALYTICAL CHEMISTRY

 

 

Date & Time : 01-11-2006/1.00-4.00   Dept. No.                                                       Max. : 100 Marks

 

 

 

PART – A

 

Answer all the questions                                                     (10 ×2 = 20 marks)

 

1. What is a universal antidote?
2. State how many significant figures are there for the following?
3. a) 0.00200    b) 99.9   c) 9.023 d) 0.00149
4. What is meant by test of purity?
5. Give the factors affecting R_f value.
6. Distinguish between end point and equivalence point.
7. What is the significance of titration curve?
8. Draw the structure of M²⁺-EDTA complex.
9. What are precipitation titrations?
10. Explain gravimetric factor.
11. Define thermogram.

 

PART – B

 

Answer any eight questions                                                (8 × 5 = 40 marks)

 

11. How would you calibrate a burette?
12. A student obtained the following results for the percentage of manganese in a mineral 30.48, 30.71, 30.07, and 30.62.
    Calculate the a) median b) average deviation
13. Explain distillation under reduced pressure.
14. Give the principle and applications of gas chromatography.
15. Give the criteria for primary standard substances.
16. Calculate the pH of the buffer mixture containing 5 g of CH₃COOH and 7.5 g CH₃COONa in 500mL solution. Dissociation constant of CH₃COOH at 25 °C is 1.75 x 10^-5.
17. What are the characteristics of metal ion indicators?
18. 20 mL of a NaOH solution containing 4g of NaOH per litre required for complete neutralization 22 mL of a solution of hydrochloric acid. Calculate the normality of HCl and amount in gram per litre.
19. Describe the application of solubility product principle in qualitative analysis.
20. Describe the method of locating the end point in the acid-base titrations.
21. Mention the factors affecting a thermogram?
22. Explain the mechanism of precipitate formation.

 

 

 

 

PART – C

 

Answer any FOUR questions                                                 (4 × 10 = 40 marks)

 

23. List out the rules to be followed in storage and handling of chemicals.
24. Discuss the various components of TG with a block diagram.
25. a) Derive the expression for the pH of a buffer solution.
26. b) Calculate the pH of 100 ml of  05 M HCl and 100 ml of 0.02 M solution of HNO₃ at 25°C.
27. What is distillation under reduced pressure? Explain with suitable example.
28. Replicate samples of a silicon alloy are analysed and determined to contain 95.61, 95.67, 95.71 and 95.60 % of Ag. Calculate the mean and standard deviation.
29. What are Ion exchange resins? How are they used in the purification of water?

 

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