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Q.

If two liquids A and B form minimum boiling azeotrope at some specific composition then ______.

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a

AB interactions are weaker than those between AA or BB

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

AB interactions are stronger than those between AA or BB

answer is D.

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Detailed Solution

When solute-solvent or A-B interactions are weaker than the A-A or B-B interactions, molecules of A or B will find it easier to escape than in pure state. This will increase the vapour pressure and result in positive deviation from Raoult's law. Such solutions are called minimum boiling azeotropes.

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If two liquids A and B form minimum boiling azeotrope at some specific composition then ______.