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THIRD SEMESTER (CUCBCSS-UG) DEGREE EXAMINATION
NOVEMBER 2021

Chemistry
CHE 3B 03—PHYSICAL CHEMISTRY—I
(2014—2018 Admissions)

: Three Hours Maximum : 80 Marks

Section A

Answer all questions.
Each question carries 1 mark.

What is compressibility factor of a gas ?

Define mean free path.

Give example of an isolated system.

What is Zeroth law of thermodynamics ?

Enthalpy of neutralization of weak acid and weak base will be always less than — 57.1 kJ. Why ?
What is the standard molal enthalpy value of O, ?

State Poiseulle’s equation for the determination of viscosity of a liquid.

Total molar refractivity of a solution where n, and n, are the mole fraction andr, andr, are molar

refractivity values of the solvent and solute respectively can be written as....
State Law of mass action.
What is the effect of pressure on the decomposition equilibrium reaction of HI to H, and I, ?
(10 x 1 = 10 marks)
Section B

Answer any ten questions.

Each question carries 2 marks.
Calculate the RMS velocity of SO, molecule at 427°C.
Why do real gases deviate from ideal behaviour ?
State the virial equation of state.

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