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Solutions

Short Answer Type

91. Define the following terms:
Molarity

228 Views

92. Define the following terms:
Mass percentage.

177 Views

93. What role does the molecular interaction play in solution of alcohol and water?

151 Views

94. Why do gases always tend to be less soluble in liquids as the temperature is raised?

167 Views

Long Answer Type

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

1458 Views

96. What is meant by positive and negative deviations from Raoult’s law and how is the sign of Δ_mix H related to positive and negative deviations Raoult’s law?

1874 Views

Short Answer Type

97. Methanol is soluble in water but insoluble in octane. Explain briefly.

Answer:

Solubility of a substance is its maximum amount that can be dissolved in a specified amount of solvent at a specified temperature. It depends
upon the nature of solute and solvent as well as temperature and pressure. In general, a solute dissolves in a solvent if the intermolecular interactions are similar in the two or we may say like dissolves like.

Like dissolves like means compounds with similar polarity will dissolve in compounds with similar polarity or electrical properties

Methanol and water both are polar and hydrogen bond forming molecules. Thus, they will form homogeneous solution. Whereas octane is non-polar molecule and will not form solution with methanol.

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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.

556 Views

Long Answer Type

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

957 Views

Short 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.

466 Views