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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
B.Sc.DEGREE EXAMINATION -CHEMISTRY
FIRST SEMESTER APRIL 2018
17/16UCH1MC02 CH 1505 CH 1502 ANALYTICAL CHEMISTRY
Date: 26-04-2018 Dept. No. Max. 100 Marks
Time: 09:00-12:00
PART A
ANSWER ALL QUESTIONS:10x 2 20 Marks
1. What do you mean by carcinogens? Give an example.
2. Calculate the median and arithmetic mean of the following data. 20.1, 20.0, 20.2, 19.9 and 19.8.
3. Mention the use of Alumina in Column Chromatography.
4. What is retention factor?
5. Calculate the normality of NaOH if 4.0 g of NaOH is dissolved in 100 mL ii) 500mL.
6. Identify the following as primary or secondary standard Copper sulphate pentahydrate
Potassium permanganate.
7. Draw the structure of EDTA and mention the nature of this ligand.
8. Mention the precipitating agents for the estimation of Barium as Barium Chromate
ii) Sulphate as barium sulphate.
9. How are the plots of TGA and DTA drawn?
10. Mention the factors that influence the thermogram.
PART B
ANSWER ANY EIGHT QUESTIONS:8 x 5 40 Marks
11. Write a note on determinate errors. How can they be minimised?
12. Explain in brief the general storage and handling of acids and ethers.
13. Mention the salient features of TLC.
14. Explain the principle involved in steam distillation ii) vacuum distillation.
15. What are the characteristics of a primary standard?
16. Distinguish Molarity from Molality. Calculate the Molarity when 126g of Oxalic acid dihydrate is made up in 1 Litre of water.
17. Calculate the pH of the following. 0.001 N HCl ii) 0.1 N NaOH.
18. Distinguish Co precipitation from Post precipitation.
Nucleation from Crystal growth
19. Mention the importance of TGA.
20. What are the physical parameters that can be obtained from DTA?
21. Mention the advantages of Organic precipitating agents over Inorganic precipitating agents?
22. Calculate the ionic strength of 0.1N solution of NaCl ii) 0.1 N Solution of Na2SO4.
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PART C
ANSWER ANY FOUR QUESTIONS:4 x 10 40 Marks
23. Mention the importance of MSDS of a chemical
Mention the number of Significant Figures in 6.023 x 1023 ii) 6.626 x 10-34
24. Explain the following terms Elution ii) Seeding.
What are the factors that influence column efficiency.
25. Sketch schematically the distillation apparatus setup for the distillation of two miscible liquids and explain the principle involved.
Explain the principle involved in the estimation of Magnesium by complexometric titrations.
26. What is Buffer solution? Mention any four buffer solutions.
Distinguish Accuracy from Precision .
ii) Mention any three acid-base indicators .
27. Mention the principle and procedure involved in the estimation of halide ions by Volhard method.
Mention any two organic precipitating agents with their structures.
28. Explain the DTA Curve of Calcium oxalate monohydrate.
Sketch and explain the TGA Curve for Silver Nitrate.