Why do mixtures not obey the law of constant composition?

State law of constant composition.

What is Prouÿs law of constant composition ?

Assertion : Stoichimetric compounds obey the law of constact composition Reason: Schottky and frenkel defect are observed in Stoichimetric compounds

In a mixture of closely related liquids (such as benzene and toluence), the Roult's law states that the ratio P_(A) is proportional to the mole fraction of A in the liquid, P_(A)x_(A) . Mixtures that obey the law throughout the composition ranges from pure A to pure B are called ideal solutions . In ideal solution the solute also obeys Roult's law . Then the total pressure is given by P_("total")=P_(A)^(0)x_(A)+P_(B)^(0)x_(B) Each of the following solution obeys Raoult's law except

In a mixture of closely related liquids (such as benzene and toluence), the Roult's law states that the ratio P_(A) is proportional to the mole fraction of A in the liquid, P_(A)x_(A) . Mixtures that obey the law throughout the composition ranges from pure A to pure B are called ideal solutions . In ideal solution the solute also obeys Roult's law . Then the total pressure is given by P_("total")=P_(A)^(0)x_(A)+P_(B)^(0)x_(B) For the solution which obeys Roult's law , which of the following is incorrect ?

Point out the limitations of the law of constant composition if any.

Which scientist gave law of constant composition ?

In which of the following hydride law of constant composition does not hold good.