Discussion
In a compound-forming system the intermediate compound melts congruently if it
Answer: A
Correct answer: melts sharply to a liquid of its own composition
A congruently melting compound gives a maximum on the liquidus and behaves like a pure substance at that point - the diagram can be treated as two simple eutectic systems joined at the compound. Incongruent melting instead decomposes the compound into a solid and a liquid of different composition, which is the peritectic case.
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