Question

The boiling point of an azeotropic mixture of water and ethyl alcohol is less than that of theoritical value of
water and alcohol mixture. Hence the mixture shows:

• A. that solution is saturated
• B. positive deviation from Raolt's law
• C. negative deviation from Raoult's law
• D. that solution is super saturated

Answer 1

Answer: (B)

positive deviation from Raolt's law

When a solution shows positive deviation from Raoult's law, the vapour pressure of the solution is high relative to a vapour pressure of pure components. Hence, the solution boils at the lower temperature than it's components.

So, option B is correct.