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 Multiple Choice QuestionsShort Answer Type

91. Define the following terms:
Molarity
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92. Define the following terms:
Mass percentage.
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93. What role does the molecular interaction play in solution of alcohol and water?
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94. Why do gases always tend to be less soluble in liquids as the temperature is raised?


Answer:

When gas dissolve in liquid it generate a small quantity of heat so we can say that dissolution of gas in a liquid is a exothermic reaction.
Gas + liquid  < --- >  solution  + heat

According to le Chatelier's principle when we increase the temperature in a exothermic reaction , the reaction will move to back ward direction that means solution will dissociate and will give gas .Hence with the rise of temperature gas will less soluble.


For most of gases like N2, O2, He etc. the value of Henry's constant, KH increases with temperature and as a result of this solubility of gases decreases with increase of temperature. We know, at given temperature.
Partial pressure of gas in solution = KH x mole fraction of gas in sol. KH depends on the nature of gas. For example, KH value of O2 at 293 K is 34.86 while at 393 K it is 46.82 kilo bar.

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 Multiple Choice QuestionsLong Answer Type

95. State Henry’s law and mention some important applications.
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96. What is meant by positive and negative deviations from Raoult’s law and how is the sign of Δmix H related to positive and negative deviations Raoult’s law?
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 Multiple Choice QuestionsShort Answer Type

97. Methanol is soluble in water but insoluble in octane. Explain briefly.
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98. Given below is the sketch of a plant for carrying out a process.

(i) Name the process occurring in the above plant.
(ii) To which container does the net flow of solvent take place?
(iii) Name one SPM which can be used in this plant.
(iv) Give one potential use of the plant.

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 Multiple Choice QuestionsLong Answer Type

99. Prove that the relative lowering of vapour pressure is equal to the mole fraction of non-volatile solute in the solution.
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 Multiple Choice QuestionsShort Answer Type

100. Explain why freezing point of a solvent is lowered on dissolving a non-volatile solute into it? Give an important application of the phenomenon of depression in freezing point.
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