LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

           B.Sc. DEGREE EXAMINATION – CHEMISTRY

GH 19

FIFTH SEMESTER – APRIL 2008

CH 5501 – ANALYTICAL CHEMISTRY

 

 

 

Date : 30-04-08                  Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

Answer the following:                                                                       (10×2=20)

1. Distinguish between ‘precision’ and ‘accuracy’ of analytical data.
2. What are antidotes? Cite two examples.
3. What are drying agents? Cite two examples
4. What are R_f values? Mention their significance.
5. Define the term Normality.
6. What are redox indicators? Give two examples.
7. What is solubility product? What is its application?
8. Define the term peptization.
9. State the Beer-Lamberts law. Give its use.
10. What is the wave number corresponding to 10.

 

PART – B

Answer any EIGHT of the following:                                             (8×5=40)

1. How are pipettes and standard flasks Calibrated?
2. Explain the types of error. Give the methods of minimising them.
3. Explain the chemical methods of purification and test of purity.
4. Explain the principle and procedure for Ion-exchange chromatography.
5. Derive the Henderson’s equation.
6. Explain the primary and secondary standards.
7. Explain how Erio-chrome black.T functions as an indicator in EDTA titrations.
8. The solubility product of AgCl at 25⁰C is 1.78 x 10^-10. Calculate its solubility in morality.
9. Distinguish between co precipitation and post precipitation.
10. Explain the following: (a) Line width in a spectrum. (b) Auxochromes.
11. What are selection Rules? Give them for electonic (Uv-vis) spectorscopy.
12. Describe the types of vibrational modes of a non-linear triatomic molecule.

 

PART – C

Answer any FOUR of the following:                                              (4×10=40)

1. How is Standard Deviation calculated for a set of analytical data.
2. Discuss on the principle and experimental techniques of Fractional distillation.
3. (a) Explain the principle and preparation of TLC.

(b) How will you determine the relative strength of acids from K_a values.

1. (a) Explain the various types of titrations?

(b) Explain the use of phenolphthalein and methyl orange as indicator.

1. Write notes on:

(i) Sequestering agent             (iii) Nucleation

(ii) Common – ion effect        (iv) Homogenous precipitation

1. Discuss on the functional group analysis in IR spectroscopy.

 

 

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