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Match each term with what it identifies on a temperature composition diagram.
List I
A. Bubble point curve
B. Dew point curve
C. Tie line
D. Azeotrope
List II
1. a horizontal line joining phases in equilibrium
2. the boundary of the all-liquid region
3. the point where the two curves touch
4. the boundary of the all-vapour region

  • A.A-2, B-4, C-3, D-1
  • B.A-3, B-1, C-4, D-2
  • C.A-2, B-4, C-1, D-3
  • D.A-4, B-2, C-1, D-3

Answer: C

Reading a phase diagram is a matter of knowing which curve bounds which region and what a horizontal cut means. The tie line in particular is what the lever rule is applied to. Every diagram is drawn at one stated pressure.

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