Question

Which of the following is correct for solution showing positive deviations from Raoult's law
a)dV=+ve and dH=+ve
b)dV=-ve and dH=+ve
c)dV=+ve and dH=-ve
d)dV=-ve and dH=-ve

How to find positive and negative deviations from raoults law?

Answer 1

Answer:

option a

Explanation:

It can be learned as a fact cause its directly asked in exams

The thing to keep in mind is that

1.If a solution shows positive deviation from roult's law then its dV and dH both will be positive

2.And if the solutions shows negative deviation then dV and dH will be negative.

Positive deviations is usually shown by solutions having alcohol. Positive deviation happens due to the breaking of hydrogen bonds which requires energy.

Negative deviation is usually shown by solutions having acids. negative deviations happens due to formation of hydrogen bonds in the solution which releases energy.

Hope this helps.

Answer 2

Explanation:

option A isnthe correct answer