M.Sc. (Semester (CBCS) Examination Nov/Dec-2018
Chemistry
PHYSICAL CHEMISTRY I
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Use of log table and calculator is allowed. Figures to the right indicate full marks.
Section I
Q.1
Multiple choice questions:
14
In the limit T→ for a crystal, ST
Cp/2
Cp/3
Cp/4
Cp
Which of the following is path dependent function?
q
H

S
When a beam of light is passed through a colloidal solution or a macromolecular solution, it suffers scattering. This phenomenon is called effect.
Raman
Tyndall
Rayleigh
Stark
Which of the following compound has non zero entropy even at 0
N2
H2
NH3
O2
At CMC, properties of solutions of surfactants undergo dramatic change.
surface tension
osmotic pressure
molar conductance
all of these
Complete the equation
dP
dV
dT
dG
is the only colligative property that can be useful for investigating macromolecules.
vapor pressure
osmotic pressure
melting point
boiling point

In Flash photolysis radiation is used for giving short pulse.
X-ray
UV-Vis
γ
cosmic
All gases behaves ideally as
P→1
P →0
P →∞
P →
10) Polydispersity index is given as
MW MN
MN MW
MW MN MN
MN MW MN
Page 2 of 2
SLR-VF-119
11) At chemical equilibrium remains constant
P
V

S
12) In microcanonical ensemble V and remains constant.
P
T

E
13) The probability of selecting a card of heart of square from a standard deck of 52 cards is
13/52
1/52
4/52
2/52
14) The mathematical statement for Boltzmann-Planck equation is given as
S kln W
S kNln W
S k/ln W
S ln W/k
Q.2

Answer the following (Any Four)
08
Define degrees of freedom
What do you mean by term most probable configuration?
Define ensemble. Mention different types of ensembles
What is critical micelle concentration?
Give the statement for third law of thermodynamics.

Write notes on (Any Two)
06
Second law of thermodynamics
Pressure jump method for study of kinetics of fast reactions
Types of colloids
Q.3

Answer the following(Any Two)
08
Estimate the number of configurations and corresponding microstates for the system in which 5 vibrating molecules has to distribute 3 hv energy.
The activity of 3 moles of a substance changes from 0.075 to 0.40. What would be the change in its free energy at 298
For the dissociation of water, the relaxation time obtained is 120 microseconds and the equilibrium constant is 1.011 x10-14. Calculate the rate constants for both forward and backward reactions.

Answer he following (Any One)
06
Derive any one thermodynamic equation of state.
Mention Maxwell-Boltzmann distribution law. Evaluate the M-B constants α and β.
Q.4

Answer the following (Any Two)
10
Kinetics of condensation polymerization
Derive Maxwell relations.
Explain entropy change during phase transformations.

Answer the following (Any One)
04
What is surfactant? Give the classification of surfactans
Derive Boltzmann-Planck equation.
Q.5
Answer the following (Any Two)
14
Explain freezing point depression method for determination of activity coefficient.
Explain Osmometric method for determination of molecular weight of a polymer
Describe stopped flow method for studying kinetics of fast reactions.