BBA Iind SEMESTER EXAMINATION 2008-09 s5

B.Sc. (Hons) Chemistry V (Fifth) Semester Examination 2014-15

Course Code: BAS512 Paper ID: 0985219

Analytical Chemistry

Time: 3 Hours Max. Marks: 70

Max Marks: 75

Note: Attempt six questions in all. Q. No. 1 is compulsory.

1. Answer any five of the following (limit your answer in 50 words). (4x5=20) a) Distinguish between: i) Analyte and sample ii) Quantitative and qualitative analysis b) Distinguish between accuracy and precision. c) What types of electrons in a molecule are generally involved in the absorption of UV or visible radiation? d) What is a necessary criterion for absorption to occur in the infrared region? e) Redox titration cannot be carried out by conductometry. Explain. f) In conductometric titration of strong acid with strong base, the conductance decreases in the beginning and increases after neutralization point. Explain. g) Describe the basic principle of ion-exchange chromatographic processes. h) Explain the difference between a cation exchange resin and an anion exchange resin.

2. a) Define the following statistical test for analytical data: (5) i) f-test ii) Q-test iii) t-test b) Calculate the mean and standard deviation of the following 7. a) Distinguish between the principle of thin layer set of analytical results chromatography and paper chromatography. (5) 15.67gm, 15.69gm, 16.03gm. (5) b) Write some applications of ion-exchange chromatography. (5) 3. a) What is Beers-Lambert law? Describe and compare different causes for derivation from Beers law. 8. Write short notes on any two of the following: (5+5) (5) a) Absorption of electromagnetic radiation by molecule b) Write the names and their functions of different b) Principle and procedure involved in conductometric components of single beam spectrophotometer. titrations (5) c) Classical and modern methods of chemical analysis

4. a) The most widely used wavelength region for infrared analysis is about 2-15μm. Express their range in angstrom and in wavenumbers. (2) b) Define the following terms: (4) i) Chromophore ii) Auxochrome iii) Bathochromic shift iv) Hypsochromic shift c) Write the name and describe the function of one detector which is used in IR spectrometery. (4)

5. a) Explain the term electrode potential. What is meant by standard electrode potential?. (4) b) Describe the principle underlying potentiometeric titrations. How would you carryout potentiometric titration of a solution of HCl against a standard solution of NaOH. (6)

6. a) Describe the qualitative and quantitative aspects of chromatographic method of High Performance Liquid Chromatography (HPLC). (5) b) What is the molecular sieve? Give the name of a popular molecular sieve for separation of proteins. Explain with suitable examples gel filtration and gel permeation chromatography. (5)