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A eutectic mixture is the composition of a two-component system that

  • A.melts at the lowest temperature of any mixture of the pair
  • B.melts at the highest temperature of any mixture
  • C.contains equal masses of the two components
  • D.forms a single compound on solidification

Answer: A

Correct answer: melts at the lowest temperature of any mixture of the pair

The eutectic is the minimum on the liquidus, the composition at which the two branches meet, and it melts lower than either pure component. This is the basis of solders and of low-melting alloys generally, and it is why a salted road stays liquid below zero.

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