GH 42

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – APRIL 2008

CH 3900 – INSTRUMENTAL ANALYSIS (FOR PHYSICS)

 

 

 

Date : 05-05-08                  Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART-A

 

Answer ALL questions:                                                                   (10×2=20 marks)

1. How will you prepare a standard solution of 0.1 N K₂Cr₂O₇

(Molecular mass = 294) in 250 ml water?

1. Calculate the pH of a solution obtained by mixing 500 ml of 0.05M NaOH with 500 ml of 0.1 M HCl?
2. What is bathochromic shift? Give an example.
3. Calculate the solubility of AgCl_(s) in 0.01M NaCl solution

(K_sp of AgCl is 1×10^-10).

1. What is Nerst glower?
2. List the factors affecting DTA curves.
3. What are the characteristics of a primary standard? Give an example.
4. What are mobile and immobile phases in TLC?
5. What are the significance of
6. Define value. What are its significances?

 

PART-B

 

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

1. Derive Beer-Lambert’s law. Explain.
2. Explain the principle involved in the fractional distillation.
3. Explain the thermogram of calcium acetate monohydrate.
4. How is a mixture of halides separate by ion-exchange chromatography?
5. What are the uses of TGA and DTA Distinguish between them.
6. Discuss the principle involved in Flame photometry.
7. How would you separate the following

• o – nitrophenol and p-nitrophenol
• naphthalene and benzoic acid

1. Explain the working of a gas chromatograph with an example.
2. How would you determine the pH of an acid using potentiometer?
3. How will you separate aminoacids using paper chromatography?
4. Explain the uses of soxhlet extractor.
5. Write notes on (a) Molar absorptivity             (b) Diverse ion effect.

 

PART-C

 

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

1. Explain the principle, instrumentation and working of gas chromatograph.
2. Explain the thermogram of

• CaC₂O₄. H₂O
• CuSO₄.5H₂O

with neat diagrams.

1. a) What are buffer solutions?

Explain the buffer action.

1. b) Calculate the pH of a solution containing 500ml of 0.01M NH₄OH and 500ml of 0.002M NH₄ (K_b for NH₄OH is 1.8×10^-5)

1. Write a note on UV-Visible spectro photometer. Explain its function and applications.
2. a) Explain the principle involved in absorption chromatography.

1. b) What are the importances of thermometric titrations?

1. a) Explain the principle involved in AAS. Mention the uses of AAS.

1. b) How would you determine the structure of an organic compound derived from plants?

 

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