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1. Solution and colligative properties — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry1. Solution and colligative properties1 Mark
MCQ
An aqueous solution of hydrochloric acid
  • A
    Obeys Raoult’s law
  • ✓
    Shows negative deviation from Raoult’s law
  • C
    Shows positive deviation from Raoult’s law
  • D
    Obeys 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.

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