What role does the molecular interaction play in solution of alco

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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?


Answer:


In both the components, water (A component) and alcohol (B component), the molecules are hydrogen bonded, i.e., A-A as well as B-B interactions are mainly H-bonds forces. When these two components are mixed to form the solution, due to molecular collisions A-A and B-B interactions are broken down and new interactions of the type A-B are formed. A-B interactions are also mainly H-bonds i.e., the molecules of one liquid will tend to break the hydrogen bonds in the molecules of other liquid and vice-versa. A-B interactions formed will be weaker than A-A and B-B types of of interactions as the alcohol and water solution show positive deviation and it will lead to increase in volume (ΔVmix is + ve).

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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

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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