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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?
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 Multiple Choice QuestionsLong Answer Type

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95. State Henry’s law and mention some important applications.


Answer:

Henry’s law states that the solubility of a gas in a liquid is directly proportional to pressure of the gas; temperature constant.

Mathematically, P = KH x

where
x=mole fraction of gas in solution
P is partial pressure of gas,
KH is Henry's constant.

Applications:

(1) Henry's law finds various applications in industry and enables us to explain and understand some biological phenomena. The some of important applications are : CO2 solubility in soft drinks, beverages, soda water etc. is increased by applying high pressure and bottles are sealed under high pressure.

(2) For deep divers, oxygen diluted with less soluble He gas is used as breathing gas and it minimises the painful effects due to higher solubility of N2 gas in blood.

(3) In lungs, where oxygen is present in air with high partial pressure, haemoglobin combines with O2 to form oxyhaemoglobin. In tissues where partial pressure of O2 is low, oxyhaemoglobin releases the oxygen for utilisation in cellular activities.

 
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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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