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