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Consider the following statements about the xy equilibrium curve.
1. It lies above the diagonal for the more volatile component.
2. It touches the diagonal at an azeotrope.
3. It is a straight line for an ideal solution.

  • A.1 only
  • B.All of them
  • C.1 and 2 only
  • D.3 only

Answer: C

The first two are correct. The third is wrong, since even an ideal solution gives a curved line unless the relative volatility happens to be one, in which case it lies on the diagonal itself. Curvature away from the diagonal measures the ease of separation.

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