The solution formed by adding carbon disulphide to acetone, shows positive deviation from Raoult's law. It is because

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the dipolar interactions between solute-solvent molecules are weaker than the respective interactions among the solute-solute and solvent- solvent molecules

Only solute-solvent interactions are involved in the reaction

the dipolar interactions between solute-solvent molecules are stronger than the respective interactions among the solute-solute and solvent-solvent molecules

All the dipolar interactions among solute-solvent, solute-solute and solvent-solvent are same

answer is C.

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Detailed Solution

Carbon disulphide and acetone shows positive deviation from Rault's law because carbon disulphide and acetone interactions are weaker than carbon disulphide-carbon disulphide and acetone- acetone interactions, Hence molecules of ${CS}_{2}$ or acetone will escapes easily. Hence vapour pressure increases which results in positive deviation.
Minimum boiling azeotrope is formed by ${CS}_{2}$ and acetone mixture.

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