Physical Chemistry Answers

Give the two statements of the second law of
thermodynamics given by (i) Clausius and
(ii) Kelvin. What is the entropy change of 3.5 mol
of an ideal gas during its isothermal and
reversible expansion from 2.5 x 10-3m3 to
0.25 m3?

Explain the following phenomena and give their
cause :
(a) Brownian motion
(b) Tyndall effect

State the two laws of photochemistry. Define
quantum efficiency for the formation of a
product. Why do some reactions show very high
quantum efficiency ?

(a) Differentiate between 'activated complex'
and 'transition state'.
(b) What is transmission coefficient ?

What is an ideal solution ? When 100 cm3of
liquid A and 250 cm3of liquid B were mixed, the
volume of the solution formed was 353 cm 3.
What type of solution is it, ideal or non-ideal ?
Give another example of such solutions.

starting from the definition of Helmholtz free energy (A) derive relations for its variation with
(1) temperature at a constant volume and

(2) volume at a constant temperature.

Differentiate between bond dissociation energy and Bond enthalpy with the help of one example each.

Derive an expression for Van 't Hoff factor for a solute undergoing Association.

Draw a labelled phase diagram of Bi - Cd system.

Derive van der waals eqiation from the ideal gas equation.