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

Options

  1. Athat solution is highly saturated
  2. Bpositive deviation from Raoult's law
  3. Cnegative deviation from Raoult's law
  4. Dnothing can be said

Correct answer

B. positive deviation from Raoult's law

Step-by-step solution

The boiling point of an azeotropic mixture of water and ethyl alcohol is less than that of theoretical value of water and alcohol mixture. Hence, the mixture shows positive deviation from Raoult's law. Positive deviations from Raoult's law are noticed when (i) Exp. vaue of vapour pressure of mixture is more than calculated value. (ii) Exp. value of boiling point of mixture is less than calculated value. (iii) Δ H m i x i n g = + v e (iv) Δ V m i x i n g = + v e .

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