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2 D 73620

Define vapour pressure ot a liquid. How does it depend on temperature.
State and illustrate Hess’s law.

Discuss and explain third law of thermodynamics.

Define co-efficient of viscosity.

Define parachor.
State and explain Le Chateleirs principle. ١
Why is Chemical equilibrium referred as dynamic equilibrium ?

What is optical exaltation ?
(10 x 2.= 20 marks)
Section C (Paragraph)
Answer any five questions.
Each question carries 6 marks.
Explain the reasons for deviation of real gases from ideal behavior.
What is the effect of temperature and pressure on equilibrium 280, + O, —— 2SQ, + heat.
For the formation of NH, the equilibrium constant at 673 K and 773 K are 3.58 ೬ 307 * ೩೫

1.39 x 10 respectively. Calculate the heat of reaction.
Explain Joule Thomson effect. How is it useful for liquefaction of gases by any one method.

(a) How are molar refraction measurements useful in the structural elucidation of molecules.
(b) न Calculate the refractive index of a liquid having molar refraction 12.85 cm? mol}, the molecular

mass is 60 gmol~! and density is 1.046 gem™.
Define term heat of formation and bond energy. Given the bond enthalpies of N-H, H-H and
N=N bonds are 389.435 and 945.4 kJ mol! respectively, calculate the heat of formation of ammonia.

Derive an expression for relation between entropy and probability.

Derive expression for critical constants in terms of Vander-waals constant.
(6 x 6 = 30 marks)