Stoichiometry
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

The component molecules are non polar and are of almost equal size
In the formation of solution, chemical combination/molecular association between unlike molecules takes place
No component is concentrated at the surface of the solution
The attractive forces between like and unlike molecules are almost equal

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Stoichiometry
In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B

Exhibits positive deviation from Raoult's law
Exhibits negative deviation from Raoult's law
Obeys Raoult's law
May exhibit either positive or negative deviation from Raoult's law

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