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On a Pxy diagram at constant temperature, the upper curve is

  • A.the bubble point line
  • B.the dew point line
  • C.the azeotrope locus
  • D.the critical point locus

Answer: A

At constant temperature high pressure favours the liquid, so the all-liquid region lies above and its boundary is the bubble curve. The arrangement is inverted from the temperature composition diagram, which catches many people out.

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