MCQ
An aqueous solution of hydrochloric acid
- AObeys Raoult’s law
- ✓Shows negative deviation from Raoult’s law
- CShows positive deviation from Raoult’s law
- DObeys Henry’s law at all compositions
✓
Answer
Correct option: B.
Shows negative deviation from Raoult’s law
b
Shows negative deviation from Raoult’s law. If the attraction between different molecules, for example between $HCl$ and $H_2O$ molecules, is stronger, the escaping tendency from the solution to the vapour phase will be smaller, then the partial vapour pressure will be smaller than predicted by Raoult’s law and the system exhibits a negative deviation.
Shows negative deviation from Raoult’s law. If the attraction between different molecules, for example between $HCl$ and $H_2O$ molecules, is stronger, the escaping tendency from the solution to the vapour phase will be smaller, then the partial vapour pressure will be smaller than predicted by Raoult’s law and the system exhibits a negative deviation.
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