Explain why a solution of chloroform and acetone shows negative deviation from Raoult's law.

Explanation

Solution of chloroform and acetone shows negative deviation from Raoult. s law : Negative deviation is shown when vapour pressure of resulting solution is low and its boiling point is high. Chloroform and acetone on mixing form

(H-Bond in acetone and chloroform molecules) Since new attractive forces which come into existence in these solutions are relatively stronger, therefore these solutions are accompanied by evolution of heat `(DeltaH_("mix") = `- ve).
Also because of stronger forces of attraction among molecules in solution, the molecules come closer and hence volume of solution is less than the total
`(DeltaV_("max")-ve)` .