(i) A solution or a liquid mixture which has higher vapour pressure than theoretically calculated by Raoult’s law or higher than those of pure components is called a nonideal solution with positive deviation.
(ii) In these solutions, solute-solvent intermolecular attractions are weaker than those between solvent-solvent and solutesolute interactions.
(iii) For example, solutions of acetone and ethanol, carbon disulphide and acetone, etc.
