Download OU B.Sc 2019 Dec 5th Sem (3rd Year) 8171E Chemistry (Instrumental methods of Analysis) Question Paper

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Subject: Chemistry (Instrumental Methods of Analysis)

Time: 3 Hours Paper - VI (A) (DSE E-1) Max. Marks: 60

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PART-A (5x3=15 Marks)

(Short Answer Type)

Note: Answer any five of the following questions.

1. What is continuous extraction? Give one example.
2. What is R_f value? What are the factors influencing R_f value?
3. What is the difference between paper chromatography and thin layer chromatography?

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4. Define transmittance and absorbance?
5. What is the difference between colorimetry and spectrophotometry?
6. What is the principle involved in potentiometry?
7. What is over potential?

PART — B (45 Marks)

(Essay Answer Type)

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Note: Answer ALL from the questions.

1. (a) What is the principle involved in solvent extraction? Explain counter current extraction method. (11)
   OR
   (b) How do you prepare ascending and descending chromatogram in paper chromatography?
2. (a) Explain the packing techniques in column chromatography (wet packing and dry packing). (11)
   

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   OR
   (b) Write Beer Lambert's law and write its limitations.
3. (a) How do you estimate iron in water sample by thio cyanate method? (12)
   OR
   (b) Write short note on:
   

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   (i) Normal Hydrogen Electrode
   (ii) Quin hydrone Electrode