Question:
In case of positive deviation from Raoult's law, the intermolecular attractive forces between the solute-solvent molecules as compared to those between the solute-solute and solvent-solvent molecules are
In case of positive deviation from Raoult's law, the intermolecular attractive forces between the solute-solvent molecules as compared to those between the solute-solute and solvent-solvent molecules are
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Positive deviation $\longrightarrow$ weaker attraction $\longrightarrow$ higher vapor pressure $\longrightarrow$ lower boiling point.
Updated On: Apr 22, 2026
- weaker
- stronger
- same
- independent of intermolecular forces between solute-solvent molecules.
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The Correct Option is A
Solution and Explanation
Concept:
Positive deviation from Raoult’s law occurs when:
\[
\text{A-B interactions}<\text{A-A and B-B interactions}
\]
Step 1: Understand deviation.
Weaker solute-solvent forces $\longrightarrow$ molecules escape easily $\longrightarrow$ higher vapor pressure.
Step 2: Conclusion.
Thus, intermolecular forces between solute-solvent are weaker.
Step 1: Understand deviation.
Weaker solute-solvent forces $\longrightarrow$ molecules escape easily $\longrightarrow$ higher vapor pressure.
Step 2: Conclusion.
Thus, intermolecular forces between solute-solvent are weaker.
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