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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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?
(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?
(a) It is found that the boiling point of the solution is always higher than that of the pure solvent. The elevation in boiling point is the increase in boiling point when a non-volatile solute is added to a solvent.
(b) In the above diagram ΔTb indicates the change (increase) in boiling point of solvent.
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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.
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108.What is the Van’t Hoff factor? How does is modify the equation for the elevation of boiling points?
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109.Sometimes the molecular mass determined from colligative properties of solutions, show abnormal values. Explain?
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110.What are ideal and non-ideal solutions? Mention one nearly ideal solution.
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