(DCHE 21) M.Sc. (Final) DEGREE EXAMINATION, DECEMBER 2009. 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 important components and working principle of UV-visible spectrophotometer. 2. Write the differences between Nephelometry and Turbidometry. Mention few applications of Nephelometric technique. 3. Write a comparative study of fluorimetry and phosphorimetry. 4. Describe the principle of flame photometric analysis. What are its limitations? Write few applications of FES. 5. Describe Electroanalysis at constant current. 6. Write a short note on over potential and decomposition potential. 7. Describe the principle and applications of column chromatography. 8. Write the applications of ion-exchangers in the separation of inorganic mixtures. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Describe the instrumentation and working principle of Infrared spectroscopy. How IR can be used for structure determination? Write about the determination of Manganese by using visible spectrophotometer. Describe about different techniques to increase precision in UV-visible spectrophotometric studies. Describe the principle and applications of photometric titrations.
10. (a) Describe the instrumentation and theory of Atomic Absorption spectrophotometer. Mention the advantages of AAS over flame emission spectrometer. What are the limitations of fluorimetry? Explain the factors affecting fluorescence. Describe the errors in flame photometry. Write few applications of flame photometric technique. Describe the interferences that occur in Atomic Absorption spectroscopy. How can you overcome these interferences? 11. (a) Discuss in detail the principle, working and instrumentation of polarography. Describe the principle underlying conductometric titrations. Describe the principle underlying coulometric analysis. Mention few applications of this technique. Write a detailed note on different types of electrodes. 12. (a) Describe the principle of solvent extraction. Explain the factors affecting solvent extraction. Write few applications of solvent extraction. Explain the action of ion-exchangers. What are the important components of Gas-Liquid Chromatography (GLC)? Write its working principle and few applications. Write about the advantages of HPLC over GLC.
(DCHE 22) M.Sc. DEGREE EXAMINATION, DECEMBER 2009. Second Year Chemistry Paper VI INORGANIC CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. Write about the occurrence of lanthanides. How can you extract and separate lanthanides? 2. What is actinide contraction? Describe the general properties of actinides. 3. Describe the important components of IR spectroscopy. Write few applications IR for the study of inorganic molecules with suitable examples. 4. How can you collect Data in X-ray diffraction studies? Explain the method of analysis of data for the structural elucidation. 5. Write any one method for the determination of magnetic susceptibility of a compound. 6. Describe the formation of different fragmentation in mass spectrometry. Write few applications to metal compounds. 7. Describe the role of natural antibiotics as ionospheres. Add a note on metal DNA interactions. 8. Write a detailed note on synthetic oxygen carriers. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Write a comparitive study on the oxidation states of lanthanides and actinides. Write the chemical reactions of lanthanides. Write a comparitive study of colour and magnetic properties of lanthanides and actinides. Write few uses of lanthanide compounds. 10. (a) Describe the instrumentation and working principle of Raman spectroscopy. Mention few applications in structural elucidation of in organic samples. Describe the instrumentation and working principle of electronic absorption spectroscopy. Write few applications in molecular addition compounds.
11. (a) Describe the instrumentation and working principle of NMR spectroscopy. Write about chemical shift in NMR spectra. Write few applications to metal clusters. Describe the basic instrumentation and working principle of ESR spectroscopy. What do you understand by Hyperfine splitting and g factor? 12. (a) Write a detailed note on oxygen finding proteins. Add a note on models for oxygen finding. Write a detailed note on metal enzymes.
(DCHE 23) M.Sc. DEGREE EXAMINATION, DECEMBER 2009. Second Year Chemistry Paper VII ORGANIC CHEMISTRY Time : Three hours PART A (4 10 = 40 marks) Answer any FOUR questions. Maximum : 100 marks 1. Write a short note on various electronic transitions. (10) 2. How to distinguish the following compounds using IR spectroscopy? (a) Primary, secondary and tertiary amines. (5) Para-hydroxy benzaldehyde and ortho-hydroxy benzaldehyde. (5) 3. Write a short note on : (10) (a) Chemical shift Spin-spin intraction. 4. Discuss the following with suitable examples. (10) (a) Mc hafferty rearrangement Nitrogen rule. 5. Explain Norrish type I and II reactions with suitable examples. (10) 6. What is (1, 3)-sigmatropic rearrrangement? Discuss the mechanism of Claisen rearrangement with suitable examples. (10) 7. Write the synthesis of terpeneol. (10) 8. Discuss the mechanism of the following rearrangements with suitable example. (10) (a) Neber rearrangement Beckmann rearrangement.
PART B (4 15 = 60 marks) Answer ALL questions. UNIT I 9. (a) (i) Calculate the y max for the following compounds. (10) (1) (2) (3) (4) (5) (ii) Write a short note on the following. (5) (1) Bathochromic shift (2) Hypsochromic shift. How would you distinguish between the following? (15) Pairs of organic compounds using IR spectroscopy. (i) C 6 H5 COOCH3 and CH 3 COOC6 H5 (ii) CH 3 C C H and CH 3 C N (iii)
(iv) (v) O CH3 CH2 CHO and CH3 C CH3 CH O CH C Cl and CO2 CH2 OCH 3. 3 2 UNIT II 10. (a) Write a short note on following terms. (15) (i) (ii) Coupling constant Anisotropic effect (iii) Ring current effect. How do you distinguish between the following pairs of compounds by mass spectroscopy? (i) (ii) (iii) UNIT III 11. (a) Explain the following with examples. (i) (ii) Photoreduction Quenching (iii) Photochemical oxidation. (i) State the Hoffmann-Woodward rules for electrolytic reactions. (ii) Explain the conversion of 1, 3 -butadiene to cyclobutenes by FOT. UNIT IV
12. (a) Write the synthesis of morphine. Discuss the mechanism of the following rearrangements with suitable example. (i) (ii) Benzil-Benzilic acid rearrangement Favorskiile rearrangement (iii) Hoffman rearrangement.
(DCHE 24) M.Sc. DEGREE EXAMINATION, DECEMBER 2009. Second Year Chemistry Paper VIII ENVIRONMENTAL CHEMISTRY Time : Three hours PART A (4 10 = 40 marks) Answer any FOUR questions. Maximum : 100 marks 1. Describe the nomenclature in the study of environmental chemistry. 2. Write a detailed note on the functions of soil and soil colloids. 3. What are acid rains? Write about the measures to be taken for the control of acid rains. 4. Write a detailed note on the organic pollutants and photochemical smog in air. 5. What is hydrosphere? Write in detail about hydrological cycle. 6. Write about the chemical methods of analysis for the determination of lead and arsenic in water samples. 7. Describe the importance of monitoring instruments and principles in the analysis of environmental samples. 8. Write about the flash distillation and disinfection methods for water treatment. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) What is Lithosphere? Explain the effects of plants and animals on weathering. How can you determine phosphorous and silicon in soil samples by chemical methods. Describe the soil formation and development. Mention the factors affecting soil development. How can you determine total nitrogen content in soil samples?
10. (a) Describe the atmospheric sources and erosion of air pollutants. Describe the air pollution caused by radioactive substances. Write the analysis of aromatic hydrocarbons in air samples. How can you analyze sulphur dioxide, hydrogen sulfide and ammonic in air samples? Explain the analysis of carbon monooxide in environmental samples. 11. (a) State the water quality parameters. Explain in detail about the domestic and industrial water pollution. Describe the effects of pesticides and hydrocarbons with regard to water pollution. Describe the effects of solid wastes and thermal wastes with regard to water pollution. Describe the composition of sea water. 12. (a) Describe the method and principle of secondary and territory water treatment. How can you analyse dissolved oxygen in water samples? Write about the solar stills and ion-exchange methods for water treatment. Describe the method of determination of BOD and phosphates in water samples.