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State whether the following is true or false.
At the bubble point the vapour formed has the same composition as the liquid.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: B

The first bubble is richer in the more volatile component, which is exactly what makes distillation possible. Only at an azeotrope do the two compositions coincide, and that is why an azeotrope cannot be separated by simple distillation.

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