What type of non-idealities are exhibited by cyclohexane-ethanol and acetone-chloroform mixture ? Give reason for your answer.

Explanation

Ideal solutions are those which obey Raoult.s law over extreme range of concentration. Ideal solution have another important properties : (i) `Delta H_(mix) =0 (ii) Delta V_(mix) =0` Here-forces of attraction between A-A, B-B and A-B are of the same order. Non ideal solutions do not obey Raoult.s law over the entire range of concentration.
`Delta H_(mix) ne 0 and Delta V _(mix) ne 0`
Cyclohexane-ethanol mixture shows positive deviation from Raoult.s law because forces of attraction between cyclohexane and ethanol are less than in between puire cyclohexane as well as pure ethanol.
Acetone-Chloroform mixture shows negative deviation from Raoult.s law because forces of attraction between acetone and chloroform are higher than that in between pure acetone and pure chloroform molecules.