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An aqueous solution of hydrochloric acid -

Options

  1. AObeys Raoult’s law
  2. BShows negative deviations from Raoults’ law
  3. CShows positive deviations from Raoults’ law
  4. DObeys Henrys’ law at all compositions

Correct answer

B. Shows negative deviations from Raoults’ law

Step-by-step solution

It shows negative deviation from Raoult’s law. If the attraction between different molecules (for example, between HCl and H 2 O molecules) is stronger, the escaping tendency from the solution to the vapour phase will be smaller. As a result the partial vapour pressure will be smaller than predicted by Raoult’s law and the system exhibits a negative deviation.

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