Class 12 Chemistry

Chapter 2 - Solutions

(Magical Series) Very Important Questions Set 3

 

Q.1.     What is the similarity between Raoult's law and Henry's law?

Q.2.     The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

[Ans: Liquid mixture: A = 0.40, B = 0.60. Vapour phase: A: 0.30, B: 0.70]

Q.3.     What is meant by positive deviations from Raoult's law? Give an example. What is the sign of ∆_mixH for positive deviation?

Q.4.     What type of azeotrope is formed by positive deviation from Raoult's law? Give an example.

Q.5.     What is meant by negative deviation from Raoult's law? Give an example. What is the sign of ∆_mixH for negative deviation?

Q.6.     What type of azeotrope is formed by negative deviation from Raoult's law? Give an example.

Q.7.     What type of deviation is shown by a mixture of ethanol and acetone? Give reason.

Q.8.     Explain why a solution of chloroform and acetone shows negative deviation from Raoult's law.

Q.9.     What type of intermolecular attraction exists in each of the following pairs of compounds:

(i) n-hexane and n-octane

(ii) methanol and acetone

Q.10.     Define Colligative properties.

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