Give one example each of miscible liquid pairs showing positive and negative deviations from Raoult’s law. Give one reason for such deviations.

Answer:

Positive deviation from a Raoult's law:
mixture of ethanol and cyclohexane show positive deviation.
when pure ethanol is added to cyclohexane the moleculeof cyclohexane come  in between the molecule of ethanol which result in the breaking of hydrogen bond and thus positive deviation.



Negative deviation from Raoult's law:
Mixture of chloroform and acetone shows negtive deviation when these are mixed hydrogen bond is formed and negtive deviation is shown: