Discussion
A peritectic reaction on cooling converts
Answer: B
Correct answer: a liquid and one solid into another solid
\[ L + \alpha \rightarrow \beta. \] The peritectic is the reaction that produces an incongruently melting compound, and it is characteristically sluggish: the new solid forms as a shell around the old one and further reaction requires diffusion through it, so peritectic alloys often solidify out of equilibrium.
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