Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

• sizes of the component molecules are approximately equal.
• attractive forces between like and unlike molecules are approximately equal.
• component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution.
• all (a), (b) & (c).