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An experimenter reports a quadruple point for water. The correct conclusion is

  • A.a fourth solid form of ice was present
  • B.the observation is impossible for one component
  • C.the water contained a dissolved second component
  • D.the pressure must have been below the triple point

Answer: B

Correct answer: the observation is impossible for one component

\( P \le C + 2 \) gives a maximum of three phases for one component, so a quadruple point cannot exist for pure water however many forms of ice are involved - three of them together is still three phases. A dissolved impurity would make it a two-component system, which is a different system rather than a quadruple point in this one.

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