Question:
Which from following mixtures obeys Raoult's law?
Which from following mixtures obeys Raoult's law?
Updated On: Apr 26, 2026
- Chloroform + acetone
- Carbon disulfide + acetone
- Benzene + toluene
- Ethanol + acetone
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The Correct Option is C
Solution and Explanation
Raoult’s law is obeyed by ideal solutions. A solution behaves ideally when:
- Intermolecular forces between $A\!-\!A$, $B\!-\!B$, and $A\!-\!B$ are nearly equal
- No association or dissociation occurs
- Components have similar molecular size and polarity
Step 1: Analyse each mixture
- Chloroform + acetone: Strong hydrogen bonding occurs $\Rightarrow$ negative deviation from Raoult’s law (non-ideal)
- Carbon disulfide + acetone: Different polarity and weak interactions $\Rightarrow$ positive deviation (non-ideal)
- Benzene + toluene: Both are non-polar aromatic hydrocarbons with similar size and intermolecular forces $\Rightarrow$ ideal solution
- Ethanol + acetone: Hydrogen bonding present $\Rightarrow$ non-ideal
Step 2: Identify ideal solution
Only benzene + toluene satisfy all conditions for ideal behavior.
Step 3: Conclusion
Benzene + toluene obey Raoult’s law.
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