What is the difference between positive and negative deviation from ideality?

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Q. Write two difference between a solution showing positive deviation and a solution showing negative deviation from Raoult's law.

Q. The vapour pressure of a solution of the liquids A

(P^{0} = 80 m m o f H g a n d X_{A} = 0.4)

and B

(P^{0} = 120 m m o f H g a n d X_{B} = 0.6)

is observed to be 100 mm of Hg. It shows that the solution exhibits:

Q. What is meant by positive and negative deviations from Raoult's law and how is the sign of

Δ_{m i x} H

QUESTION 2.14

What is meant by positive and negative deviations from Raoult's law and how the sign of $Δ_{m i x} H$ related to positive and negative deviations from Raoult's law?

How to find whether a given non ideal solution have positive or negative deviation?

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