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A system whose components form a continuous series of solid solutions shows a phase diagram with

  • A.a maximum at the compound's melting point
  • B.two separate liquid layers below a critical temperature
  • C.a lens-shaped liquidus and solidus and no eutectic
  • D.two curves meeting at a single eutectic point

Answer: C

The two metals dissolve in one another in all proportions in the solid, so there is no composition at which two distinct solids deposit together. Copper with nickel is the classic example, its liquidus and solidus enclosing a narrow lens.

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