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On a pressure against temperature diagram for a pure substance, the vaporisation curve ends at

  • A.the critical point
  • B.the triple point
  • C.the normal boiling point
  • D.absolute zero

Answer: A

Above the critical point liquid and vapour are no longer distinguishable, so there is nothing left for the curve to separate. The triple point is the other end of the same curve, where the solid phase joins the equilibrium.

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