LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – CHEMISTRY
FIRST SEMESTER – APRIL 2008
CH 1502 – ANALYTICAL CHEMISTRY
Date : 03/05/2008 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART – A
(10 x 2 = 20 marks)
Answer ALL questions.
- The metal content in a mineral was reported as 30%. Taking the acceptable value as 32%, calculate the absolute error and relative error in ppt.
- What first aid should be given for spillage of concentrated acid and strong alkali on a person?
- Differentiate between eluent and eluate.
- What is the difference between direct titration and a back titration?
- Why would a reprecipitation be employed in a gravimetric analysis?
- What quantity is measured in TGA and in DTA?
- What are the advantages of DTA over TGA?
- What are metallochromic indicators? Give an example.
- What is a secondary standard? Mention its properties.
- Compare the solubility of lead iodide in
- i) pure water ii) 0.1 M aq KNO3 and iii) 0.1 M aq KI.
PART – B
(8 x 5 = 40 marks)
Answer any EIGHT questions.
- What are the general rules observed in the storage and handling of chemicals?
- How is a burette calibrated?
- What are the possible errors in weighing? How can they be minimized?
- Explain the principle of solvent extraction and extraction using a second solvent.
- Discuss the principle of distillation under reduced pressure.
- Explain the principle behind the separation of a mixture using paper chromatography.
- A sample of pure sodium carbonate weighing 0.3542g is dissolved in water and titrated with a solution of hydrochloric acid. A volume of 30.23 mL is required to reach the methyl orange end point. Calculate the normality of the acid solution.
- How is selection of proper indicator effected in acid-base titrations?
- What characteristics should a substance possess to be used as a primary standard for acid or base solutions?
- Explain the terms coprecipitation and post precipitation. Differentiate between them.
- Discuss the factors that affect the size of particles of precipitate in gravimetric analysis.
- Write briefly on the factors that affect the thermogram.
PART – C
(4 x 10 = 40 marks)
Answer any FOUR questions.
- The normality of a solution is determined by four separate titrations, the results being 0.2041, 0.2049, 0.2039 and 0.2043. Calculate the mean, median, range, average deviation and standard deviation and coefficient of variation.
- a) Discuss the principle and applications of GC. (5)
- b) Explain the functioning of FID in GC. (5)
- Explain the principle and methodology behind the separation of ions using
ion exchange chromatography.
- a) List out the reasons for the versatility of EDTA as titrant. (3)
- b) Explain how EDTA is used in direct, back and indirect titration methods.(7)
- a) How is chloride determined by Volhard method? (6)
- b) What are adsorption indicators? Explain (4)
- Using a block diagram, discuss the various components of TGA and DTA apparatus. (5+5)
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