CH 5501 – ANALYTICAL CHEMISTRY

Date & Time: 28/04/2007 / 1:00 – 4:00 Dept. No. Max. : 100 Marks

PART A

Answer the following 10×2 = 20

What are antidotes? Cite two examples.
What is sublimation? Mention two compounds which can be purified by this method.
How is adsorption different from absorption? Name one analytical technique, which uses adsorption phenomenon?
What are R_f values? Mention their significance.
What are primary standards and secondary standards?
What is solubility product? What is its application?
Distinguish end point from equivalence point.
What is the unit for measuring strength of an acid? Give its mathematical expression.
Explain coprecipitation and post precipitation.
Give an account of Beer-Lambert’s law. What is its use?

PART B

Answer any eight of the following: 8×5 = 40

How are burettes and standard flasks calibrated?
Explain various types of errors.
Give the principle involved in solvent extraction technique, with special reference to distribution coefficient.
How is an aromatic carboxylic acid recrystallised?
Describe the detection of compounds by thin layer chromatographic technique.
Molecular weight of a dibasic acid is 50. What is the amount of this acid required to prepare 250mL of its 0.2N solution?
Derive Henderson’s equation.
Describe precipitation titration with an example.
The solubility product of a sparingly soluble MX type salt is 10 ^-14 at 25⁰ Calculate its solubility in molarity if its molecular weight is 100.
What are the precautions to be taken to avoid error while precipitating a compound in gravimetric analysis?
What are Selection Rules? Give selection rules for electronic (UV- vis) spectroscopy.
Taking a planar triangular molecule as example, explain various types of vibrations. (Show sketch)

Cond….2

PART C

Answer any four of the following: 4×10 = 40

Write an essay on errors in chemical analysis, with special reference to types and minimizing the same.
Explain fractional distillation with an example.
In principle, how is ion exchange chromatography different from other chromatographic techniques? How is this technique useful in softening of water?
Discuss complexometric titrations.
How is indicator decided for an acid – base titration? Explain using phenolphthalein and methylorange as indicator.
Write short notes on (i) chromophores

(ii) auxochrome

(iii) signal to noise ratio

(iv) line-width

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