State Raoult's law for solution containing volatile liquid components. Taking a sutiable example, explan the meaning of positive deviation from Raoult's law .

Explanation

Part-I Raoult's law for solution containing voltatile liquids :It states that for a solution of volatile liquids , the partial vapour pressure of each component in the solution is directly proportional to its mole fraction.
Part II : Non -ideal solution shows positive and negative deviations from Raoult's law.
(i) Positive deviation form Raoul's law : When the total vapour pressure will be greater than corresponding vapoure expected on the basis of Raoult's law. This type of behaviour of solution is called positive deviation from Raoult's law.
(ii)Negative deviation form Raoul's law : When the total vapour pressure will be less than corresponding vapoure expected on the basis of Raoult's law. This type of behaviour of solution is called negtive deviation from Raoult's law.