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Three of the following are single phases. The exception is

  • A.a mixture of nitrogen and oxygen gas
  • B.a solution of sodium chloride in water
  • C.a solid solution of nickel in copper
  • D.a mixture of ice and water at zero degrees

Answer: D

Ice and water are physically distinct and mechanically separable, so together they constitute two phases rather than one. A gas mixture, a true solution and a solid solution are each homogeneous throughout and count as a single phase.

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