What is meant by positive from Raoul's Law ? Give an example an example. What is the sing of `DeltaH_(mix)` for positive deviation ?

What is meant by positive deviation from Raoul's Law ? Give an example. What is the sign of DeltaH_(mix) for positive deviation ?

What is meant by positive deviation from Raoult's law? Given an example.

What is meant by the term physical change? Give an example.

What is meant by positive deviations from Raoult's law and how is the sign of Delta_("mix")H related to positive deviation from Raoult's law ?