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Which of the following cannot occur for a one-component system?

  • A.two phases coexisting along a curve
  • B.one phase occupying an area of the diagram
  • C.four phases coexisting at equilibrium
  • D.three phases coexisting at a point

Answer: C

Correct answer: four phases coexisting at equilibrium

\( F = 1 - P + 2 \) would give \( F = -1 \), which is impossible, so at most three phases can coexist for one component. The other three all occur: areas for one phase, curves for two, and a triple point for three.

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