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Solutions

Short Answer Type

101. Give one example each of miscible liquid pairs showing positive and negative deviatins from Raoult’s law. Give one reason for such deviations.

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Long Answer Type

102. Show that the relative lowering of vapour pressure of a solution containing a nonvolatile solute is equal to the mole fraction of the solute in the solution?

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Short Answer Type

103. Which type of deviation is shown by the solution formed by mixing cyclohexane and ethanol?

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104. Why should a solution of a non-volatile solute boil at a higher temperature ? Draw the diagram to prove your point?

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105.

(a) Draw a labelled diagram to show the change in vapour pressure of a solvent, when a non-volatile solute is added to it.
(b) Show that the change in boiling point of the solvent in this diagram?

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106. Illustrate elevation in boiling point with the help of vapour pressure temperature curve of a solution. Show that elevation in boiling point is a colligative property?

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107. Why should the solution of a nonvolatile solute freeze at a lower temperature? Draw a neat diagram to prove your point.

Since the vapour pressure of a solution is lower than that of pure solvent, the temperature of freezing point of the solution is lower than that of pure solvent.
T⁰_fis the freezing point of pure liquid solvent. T_f is the freezing point of solution.