Which one is true for solutions showing positive deviation from raoult's law?

A-B interaction has nothing to do with positive deviations

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A-B interactions are weaker than than those between A-A and B-B

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A-B interactions are stronger than those between A-A and B-B

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A-B interactions are same as those between A-A and B-B

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Solution

The correct option is B A-B interactions are weaker than than those between A-A and B-B
When intermolecular attractive forces between solute-solvent(A-B) molecules are weaker than those between solute-solute and solvent-solvent then solute or solvent will find it easier to escape from the solution than in pure state. This will increase vapour pressure thus causing positive deviations.

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Similar questions

Question 21
On the basis of information given below mark the correct option.
Information
(i) In bromoethane and chloroethane mixture intermolecular interactions of A-A and B-B type are nearly same as A-B type interactions.
(ii) In ethanol and acetone mixture A-A or B-B type intermolecular interactions are stronger than A-B type interactions.
(iii) In chloroform and acetone mixture A-A or B-B type intermolecular interactions are weaker than A-B type interactions.
(a) Solution (ii) and (iii) will follow Raoult's law
(b) Solution (i) will follow Raoult's law
(c) Solution (ii) will show negative deviation from Raoult's law
(d) Solution (iii) will show positive deviation from Raoult's law

Question 23
If two liquids A and B form minimum boiling azeotrope at some specific composition then
(a) A-B interactions are stronger than those between A-A or B-B
(b) vapour pressure of solution increases because more number of molecules of liquids A and B can escape from the solution
(c) vapour pressure of solution decreases because less number of molecules of only one of the liquids escape from the solution
(d) A-B interactions are weaker than those between A-A or B-B

Q. Statement - I: The mixing of two completely miscible liquid. A and B showing positive deviation from Raoult’s law is followed by an absorption of heat
Statement - II: The A- B molecular interaction forces are stronger than the A-A or B-B molecular interaction forces.

Q. On the basis of information given below mark the correct option information.
(I) In bromoethane and chloroethane mixture intermolecular interactions of A-A and B-B type are nearly same as A-B type interactions.
(II) In ethanol and acetone mixture A-A or B-B type intermolecular interactions are stronger than A-B type interactions.
(III) In chloroform and acetone mixture A-A or B-B type intermolecular interactions are weaker than A-B type interactions.

The diagram given below is a vapour pressure-composition graph for a binary solution of $A$ and $B$ .

In the solution, A-B interactions are:

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