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Match the number of phases with the degrees of freedom for a one-component system.

1. One phase   2. Two phases   3. Three phases

P. One   Q. Zero   R. Two

  • A.1-P, 2-R, 3-Q
  • B.1-Q, 2-P, 3-R
  • C.1-R, 2-Q, 3-P
  • D.1-R, 2-P, 3-Q

Answer: D

Correct answer: 1-R, 2-P, 3-Q

Applying \( F = 3 - P \) in turn: one phase gives two degrees of freedom and appears as an area; two phases give one and appear as a curve; three phases give zero and appear as a point. The dimensionality of each region on the diagram is the phase rule made visible.

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