M.Sc. DEGREE EXAMINATION, APRIL 2017
Second Semester
Chemistry (Specialization in Nano-Science and
Technology)
PHYSICAL CHEMISTRY II
(2016 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. A rigid rotor has no zero point energy whereas a
harmonic oscillator has zero point energy. Explain.
2. Briefly mention the origin and significance of quantum
numbers.
3. What are A2 B and B2 in group theory?
4. Identify the point groups to which the following belong
sphere
equilateral triangle.
5. Compare the selection rules for IR and Raman
spectroscopy.
6. Point out the rule of mutual exclusion.
7. Briefly explain the inadequacies of conventional methods
of study the kinetics of fast reactions.
Sub. Code
538203
RW-170
2
WSS
8. How does a chain reaction differ from a normal one?
10. How does physisorption and chemisorption differ?
Part B x 5 25)
Answer all questions, choosing either or
11. Define zero point energy.
Or
What is meant by tunneling?
12. Explain reducible and irreducible representations
with example.
Or
Define symmetry element and symmetry operation.
13. Write notes on
Direct product representation and
Mention the selection rule for rotational
spectra.
Or
Based on group theory arrive at vibrational modes
of NH3 .
14. Considering hydrogen-bromine reaction establish
the rate law for the chain process. Underline the
condition for chain branching explosion to occur.
Or
Mention features of acid-base catalysis in
homogeneous catalysed reactions.
RW-170
3
WSS
15. What do you mean by semiconductor catalysts? How
does it originate?
Part C x 10 30)
Answer any three questions.
16. Explain Jahn-Teller effect. Discuss perturbation theory.
17. What are proper and improper axis of symmetry?
Describe great orthogonality theorem with proof.
18. What is SALC? Explain its application to ethylene and
butadiene.
19. For a multilayer adsorption behaviour, arrive at BET
isotherm.
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