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A two-component condensed system shows one degree of freedom. The number of phases present is

  • A.two
  • B.one
  • C.three
  • D.four

Answer: A

Correct answer: two

\[ F' = C - P + 1 \quad\Rightarrow\quad 1 = 2 - P + 1 \quad\Rightarrow\quad P = 2. \] One degree of freedom in a binary condensed system means two phases - typically a solid and the liquid along a liquidus, where fixing the temperature fixes the composition of each.

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