Discussion
A binary alloy melts sharply at a single temperature. It follows that the alloy is
Answer: A
Correct answer: of eutectic composition or a congruently melting compound
These are the two compositions in a binary system that behave thermally like pure substances, both being invariant on freezing. A pure element is not an alloy, a continuous solid solution freezes over a range at every composition except the two ends, and immiscible liquids would not give a single sharp melting point.
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