Nalanda Open University
Annual Examination 2016
B.Sc. Chemistry (Honours), Part-III
Paper-V
Time: 3.00 Hrs. Full Marks: 80
Answer any five questions. All questions carry equal marks.
1. What is fluorescence and phosphorescence? Describe these on the basis of
Jablonski diagram.
2. What do you understand by adsorption? Discuss the factors on which
adsorption depends. Discuss Freundlich adsorption isotherm. To what
extent it explains experimental data.
3. What are the postulates of the theory of absolute rate of reaction? Deduce
expression for the rate Constant.
4. What is ment by enzyme catatysit? Why are they specific in their action?
How will you explain that enzymes catalyed reaction has an optimum PH
ate which the activity of enzymes is maximum.
5. State and Explain Stark-Einstein's law of photo chemical
equivalence.
Discuss the mechanism for the formation of Hcl when the mixture of
hyrogen and chlorine exposed to light of Wavelength less than 4000Ǻ.
6. Deduce expression for 3rd order reaction given that the initial
Concentration of all there reactants are same and stoi1chiometri coefficient
is one for each of the three reactants.
7. Explain the following:
Molar viscosity Molar-Refraction
Dipole Moment
The dipole moment of NH3 is 1.48D. If the angle is calculate
the band moment of N-H bond.
8. What is miller indices of the planes of a crystal lattice? Show that all
paralled planes of any crystal lattice have same miller indices.
Given that the initial concentration of both reactants are different.
9. What do you ment by poloriability of a molecule? Derive the classics-
Mossotti equation for determination of Molar polarization in terms of
relative permittivity of the medium and induced polarizability of molecule.
10. Write short notes on any two of following:-
Chemeluminescence
Radius Ratio rule and its relation with Co-ordination number
Lambert Beez Law.