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For a binary mixture of liquids A and B, it is found that the vapour pressure of the solution is given by Pₛ = x_A(P_A⁰ - P_B⁰) + P_B⁰. Such a solution is classified as

1. Non-ideal
2. Ideal
3. Semi-ideal
4. None of these

Correct answer: Ideal

Solution

That expression is exactly Raoult's law (Ps = P_A0 x_A + P_B0 x_B), so the solution is ideal, not non-ideal.

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