Discussion
A cooling curve for a mixture of eutectic composition resembles that of a pure substance in showing
Answer: C
Correct answer: a single horizontal arrest
At the eutectic the system is invariant, so the temperature cannot fall while the latent heat is being given up, and the curve shows a flat arrest exactly as a pure substance does. The difference is microscopic rather than thermal: the solid formed is two phases intergrown, not one.
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