M.Sc. DEGREE EXAMINATION, APRIL 2018
Second Semester
Chemistry
PHYSICAL CHEMISTRY II
(CBCS 2011 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 2 20)
Answer all questions.
1. What are absorption spectrum and emission spectrum?
2. Which of the following molecules show rotational spectra?
Hcl, Co, H2 and O2.
3. The stretching vibration of Chlorine is IR inactive but
Raman active. Explain.
4. State Mutual exclusion principle.
5. What is the basic principle of NQR spectroscopy?
6. Draw the ESR spectra of methyl radical.
7. Identify the symmetry elements present in C6H6 and find
the point group of the molecule.
8. Every group consists of one element which commutes
with all the elements and leaves them
unchanged Prove.
Sub. Code
1MCH2C3
AFC-10817
2
WK16
9. Explain the symmetry selection rules for IR Spectra.
10. What is the delocalisation energy of the electrons of
cyclobutadiene?
Part B x 5 25)
Answer all questions, choosing either or


12. Discuss the principle of FT-IR Spectroscopy.
Or
Write a note on Dissociation and pre dissociation
spectra.
13. Discuss the principles of nuclear quadrupole
resonance
Or
Sketch and explain ESR Spectra of Naphthalene
anion.
14. Explain the great orthogonalilty theorem.
Or
How is the character table constructed?
AFC
15. Deduce the symmetry species for the normal modes
of vibration of H2Omolecule.
Or
Write a note on symmetry properties of integrals.
Part C x 10 30)
Answer any three questions.
16. Derive an expression for the rotational energy of a
diatomic molecule taking it as a rigid rotator. Draw the
rotational energy level diagram for such a molecule
17. What is Fermiresonance? How doe it affect the
intensities of Spectral lines?
Write a note on Frank Condon principle.
18. Differentiate between nuclear quadrapole coupling
in atoms and in molecules.
Give the principles of ESR Spectroscopy.
19. Distinguish between reducible and irreducible
representation. Explain.
Construct character table for C3V points group.
20. Discus the HMO treatment of benzene molecule.
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