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Solutions

Short Answer Type

91. Define the following terms:
Molarity

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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.

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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.

Answer:

When a non-volatile solute is added its vapour pressure is lowered and at a lower temperature, the vapour pressure of solid and liquid solvent will be equal i.e., depression in freezing point takes place. The application of ΔT_fis used as antifreeze so that water does not freeze especially in cold countries.

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