Give an example each of miscible liquid pairs showing positive and negative deviations from Raoult’s law. Give reasons for each such deviation.

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Solution

The mixtures showing positive and negative deviations are as follows:-

  1. Mixtures showing positive deviation is mixture of ethanol and acetone.

The reason behind this is :- in this case the solute and solvent interactions are weaker than the solute-solute and solvent-solvent interactions.

  • Mixtures showing negative deviation is mixture of chloroform and acetone.

The reason behind this is :- In this case the solute and solvent interactions are stronger than that of the solute – solute interactions or the solvent – solvent interactions .

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