Alagappa University 2007 M.Phil (Chemistry) , INSTRUMENTAL METHODS OF ANALYSIS (2006 Batch) - Question Paper

M.Phil. (Chemistry) DEGREE EXAMINATION,
DECEMBER 2007.
INSTRUMENTAL METHODS OF ANALYSIS
(2006 Batch)
Time : 3 hours Maximum : 100 marks

PART A — (10 x three = 30 marks)

ans ALL the ques..
1. Distinguish ranging from chromophore and auxochrome. Illustrate with examples.
2. What is the meaning of Forger-Print Region? State its usefulness.
3. Illustrate the use of INEPT method in assigning signals.
4. State any 1 reason for Nuclear Overhauser Effect and any 1 consequence of it.
5. What is the significance of hyperfine splitting in Electron Paramagnetic Resource Spectroscopy?
6. describe Isomer Shift with reference to Mossbauer Spectroscopy.
7. What is Mc Lafferty Rearrangement? provide an example.
8. State and discuss OCTANT RULE.
9. Distinguish ranging from primary caulometric analysis and secondary caulometric method.
10. Illustrate Excitation Interference which causes an fault in Flame Photometry.


PART B — (5 x six = 30 marks)

ans ALL the ques..
11. (a) explain the different factors affecting group frequencies in Infra-Red Spectroscopy. (6)
Or
(b) On the basis of Woodward Rules , compute the for the subsequent compounds : (4 ? one = 6)
(i)
(ii)
(iii)
(iv)
12. (a) provide an account of the factors affecting the chemical shift values in N.M.R. spectroscopy. (6)
Or
(b) Write the Karplus formula and draw the Karplus Curve to discuss the vicinal coupling in Proton Magnetic Resonance Spectroscopy. (6)
13. (a) Sketch and explain the Mossbauer spectra of the subsequent carbonyls : (3 + 3)
(i) Fe (CO)5,
(ii) (CO)12
Or
(b) discuss the various factors, affecting the magnitude of ‘‘g’’ in Electron Paramagnetic Resonance Spectroscopy. (6)
14. (a) What do you understand by the term : Cotton Effect? Predict the Cotton Effect by the sign of the most occupied octant in the subsequent compounds : (2 + 2+ 2)
(i)
(ii)
Or
(b) Compare the salient features of Fast Atom Bombardment and Chemical Ionization Methods of Mass Spectral measurement.
15. (a) explain any 2 applications of colorimetric measurements.
Or
(b) provide an account of theoretical principles employed in Cyclic Voltametric measurements.

PART C — (4 x 10 = 40 marks)

ans any 4 ques..
16. (a) elaborate the various kinds of electronic transitions observed in ultra voilet and visible spectroscopy? explain the effect of solvents on these transitions. (5)
(b) How will you distinguish ranging from the subsequent pairs of compounds by means of Infra Red Spectroscopy :
(i) Acetic Acid and Methyl Formate,
(ii) Ortho Nitro phenol and para Nitrophenol?
(2 + two )
17. explain the theory of
(a) Spin-Spin Splitting and
(b) Equivalent and Non Equivalent Protons, as applicable to Proton Magnetic Resonance Spectroscopy. (5 + 5)
18. (a) provide an account of the theory of recoil less emission observed in Mossbauer Spectroscopy. (5)
(b) explain the significance of Kramen’s Degeneracy observed in Electron Paramagnetic Resonance Spectroscopy. (5)
19. Illustrate the usefulness of
(a) Nitrogen Rule,
(b) Ortho Effect and
(c) Retro-Diels Alter Fragmentation as applicable to Mass Spectrometry. (3 + 2+ 5)
20. explain the principles involved in Electrogravimetric Analysis. How will you determine Cobalt by Constant Current Electrolysis? How will you estimate the percentage of metallic constituents in Brass by Control led Potential Electrolysis?
(4 + four + 2)
21. explain Atomic Absorption Spectroscopy is also known as Absorption Flame Photometry. (10)

Earning:   Approval pending.