N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Chemistry, Part-I
PAPER-IV
(Solid State Chemistry Quantum Chemistry)
Annual Examination, 2018
Time 3 Hours. Full Marks 80
Answer any FIVE Questions.
All questions carry equal marks.
1. Calculate the average distance of the electron from nucleus of Hydrogen atom in the 2s
configuration
2. Explain the Powder method of crystal structure analysis.
3. What are perfect and imperfect crystals Write notes on the cohesive energy.
4. What are intrinsic and extrinsic semiconductors Short notes on doping of a crystal.
5. State Hermitian operator. Discuss its two important properties and explain it.
6. Write notes on the following
Zero-point energy.
Basic assumption of the Hückel theory of conjugated system.
7. State the variation method and show that
H E o ˆ the integral can never be less than
the true minimum energy of the system.
8. Define bond order. Calculate the bond-order of the following molecules
Ethylene
Butadiene
9. Determine the term symbol and no. of microstates of following configuration
d2 system
d5 system
p2 system
10. Write notes on any Two of the following
Difference between a conductor, semi-conductor and non-conductor.
Pauli exclusion principles.
Angular momentum operators.