(DCHE 21) M.Sc. (Final) DEGREE EXAMINATION, DECEMBER 2010. Second Year Chemistry Paper V ANALYTICAL CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. Describe the instrumentation and working principle of Infrared spectroscopy. 2. State and explain Beer's law. What are its limitations? Add a note on photometric titrations. 3. Define the terms 'Fluorescence' and 'Phosphorescence'. Explain the factors affecting the Fluorescence. 4. Explain the principle and analytical applications of Flame Photometry.
5. What are conductometric titrations? Draw and explain the conductometric titration curve of a strong acid - strong base with an example. 6. Discuss various components of the instruments employed in electro gravimetric analysis. 7. Describe the principle and analytical applications of solvent extraction technique. 8. Describe the principle and applications of Thin layer chromatography. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Describe the instrumentation and principle of Nephelometry. Write few analytical applications of this technique. (b) How can you determine iron present in a matrix by using spectrophotometer? (c) Describe the simultaneous determination of Manganese and Vanadium in a complex matrix. (d) Write few analytical applications of IR spectroscopy. 2 (DCHE 21)
10. (a) Describe the theory and instrumentation of Atomic absorption of spectroscopy. Write few analytical applications of AAS. (b) Explain the interferences that occur in AAS and how to overcome those interferences. (c) (d) Describe the theory and instrumentation of spectro fluorimeter. Write few analytical applications of spectro fluorimetry. How can you determine phosphate by using spectrophotometer? 11. (a) Discuss the theory involved in the potentiometric redox and precipitation titrations and their advantages. (b) Explain the principle involved in electrogravimetric analysis. (c) (d) Write a detailed account on ampero-metric titrations. Write about constant current coulometry. 3 (DCHE 21)
12. (a) What are ion-exchangers? Describe the action of ion exchangers. Write few analytical applications of ion-exchangers. (b) Write the principle and applications of paper chromatography. (c) Describe the important components and working principle of Gas-Liquid Chromatography. Write few applications of GLC. (d) Describe the principle and applications of HPLC. 4 (DCHE 21)
(DCHE 22) M.Sc. (Final) DEGREE EXAMINATION, DECEMBER 2010. Second Year Chemistry Paper VI INORGANIC CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. Discuss the relationship between the oxidations states and the electronic configurations of lanthanides. 2. Compare the various properties of lanthanides and actinides. 3. Describe the assignment and intensity of electronic transitions. 4. Mention the various methods of growing crystals suitable for X-ray diffraction studies. 5. Describe the applications of ESR spectroscopy for inorganic compounds.
6. How is magnetic momentum determined experimentally? Describe a method for it. 7. Write a note on synthetic oxygen carries. 8. Discuss the applicability of antibiotics as ionophores. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Describe the extraction and separation of lanthanides. (b) Discuss the synthesis and separation of transuranium elements. 10. (a) What is the principle of infrared spectroscopy? Explain the applications of IR spectroscopy to inorganic compounds. (b) Describe the principle and applications of Raman Spectroscopy. 2 (DCHE 22)
11. (a) Explain the terms chemical shift and spinspin splitting in NMR spectroscopy. How is this technique useful in the detection of fluxional molecules? (b) Discuss the applications of mass spectroscopy to inorganic compounds. 12. (a) What are zinc containing enzymes? Describe the activity and mechanistic activity of Carboxy Peptidase. (b) Discuss the essentiality of sodium pump in maintaining the concentration gradient of alkalimetal ions. 3 (DCHE 22)
(DCHE 23) M.Sc. (Final) DEGREE EXAMINATION, DECEMBER 2010. Second Year Chemistry Paper VII ORGANIC CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. (a) Explain the various types of electronic transitions in UV region with suitable examples. (6) (b) Define the terms chromophore and Auxochrome. Give one example for each. (4) 2. Discuss the effect of Hydrogen bonding on vibrational frequencies with suitable examples. (10) 3. (a) Explain the importance of the chemical shift. (4) (b) Acetylinic protons are more shielded than ethylenic protons. Explain. (6)
4. Explain the following with suitable example. (a) Mc Lafferty rearrangement. (6) (b) Nitrogen rule and its importance. (4) 5. Predict the products and write the mechanisms involved in the following reactions. (a) (5) (b) (5) 6. Discuss the stereochemistry of, thermal and photochemical cyclisation of 4 n and ( 4n 2) system through FMO approach. (10) 7. Explain the structure elucidation and synthesis of geraniol. (10) 8. Give brief account on the Demjanov and Favorskii rearrangements. (10) PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) (i) Write down the Woodward Fieser rules for calculating absorption maxima of conjugated dienes, trienes and polyenes. (10) 2 (DCHE 23)
(ii) Calculate the max for the following compounds. (5) (b) Discuss in detail the various types of stretching and bending vibrations which arise in the IR spectrum of an aldehydes, ketones, carboxylic acids, Esters and lactones. (15) 10. (a) Write notes on the following : (i) Nuclear Overhauser Effect (NOE). (5) (ii) Shielding and deshielding of aromatic protons caused by electron donating and withdrawing substituents. (5) (iii) Effect of Hydrogen bonding on proton chemical shift values. (5) (b) Explain typical mass fragmentation of alkanes, cycloalkanes, alkenes, alkylaromatic compounds and ethers with suitable examples. (15) 3 (DCHE 23)
11. (a) Discuss the mechanism involved in the photochemical reactions exhibited by, -unsaturated ketones, olefins and aromatic compounds with relevant examples. (15) (b) What are suprafacial and antarafacial migrations? Discuss the mechanism of [1, 3], [1, 5] and [3, 3] sigmatropic rearrangement through FMO method. (15) 12. (a) Give the structure elucidation and synthesis of Quinine. (15) (b) Critically discuss the following rearrangements : (i) Beckmann. (5) (ii) Curtius. (5) (iii) Benzil-Benzilic acid. (5) 4 (DCHE 23)
(DCHE 24) M.Sc. (Final). DEGREE EXAMINATION, DECEMBER 2010. Second Year Chemistry Paper VIII ENVIRONMENTAL CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. Explain the significance of basic segments in environment. 2. Describe the basic principles of weathering. 3. Write a note on the photochemcial smog. 4. Explain the sources and emission of air pollutants. 5. Discuss on the industrial water pollution. 6. Explain the effects of soaps and pesticides with regard to water pollution.
7. Describe the monitoring of sulphur dioxide in water. 8. Write a detailed note on the ion exchange reverse osmosis in water treatment. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Explain the sampling and determination of moisture, lime and nitrogen in soil. (b) Write a note on the different factors affecting soil development. 10. (a) Explain the sources and effects of acid rains and radio active substances. (b) Describe the analysis of carbon monoxide, Carbon dioxide and ammonia in air. 11. (a) Write short notes on specific pollutants : (i) (ii) Mercury. Arsenic. (b) Give an account on agricultural, thermal and shipping water pollution. 2 (DCHE 24)
12. (a) Explain the methods for the monitoring of water pollution like hydrogen sulphide, oxides of nitrogen and carbon. (b) Write short notes on : (i) (ii) Chemical Oxygen Demand (COD. Flash distillation. 3 (DCHE 24)