Which is correct w.r.t non-ideal solution?
Solution obeys Raoult's Law over the entire range of concentration.
The vapour pressure is always higher than that predicted by Raoult's Law
The cause for the deviations lie in the nature of interactions at the molecular level
All of these
As learnt in
Condition for positive deviation -
When A - A interactions and B - B interactions are stronger than A - B interactions.
e.g. Ethanol + water
- wherein
Condition for negative deviation -
When A - A interactions and B - B interactions are weaker than A - B interactions.
e.g. Acetone + Chloroform
- wherein
Any solution that shows deviation from Raoult's law is called a non-ideal solution. Direction can be both positive and negative.
Positive deviation is observed when A-A interactions are stronger than A-B interactions.
Negative deviation is observed when A-A and B-B interactions are weaker than A-B interactions.
Option 1)
Solution obeys Raoult's Law over the entire range of concentration.
This solution is incorrect
Option 2)
The vapour pressure is always higher than that predicted by Raoult's Law
This solution is incorrect
Option 3)
The cause for the deviations lie in the nature of interactions at the molecular level
This solution is correct
Option 4)
All of these
This solution is incorrect