question_answer

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

Answer:

  (a) Mixture showing positive deviation from Raoult's law Ethanol and acetone. Reason : Solute - solvent interaction is weaker than solute solute and solvent - solvent interactions. (b) Mixture showing negative deviation from Raoult's law - chloroform and acetone. Reason : Solute solvent interaction is stronger than solute solute and solvent - solvent interaction.