GATE ME 2018 Set 2 — Question 22
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Engineering Materials → Structure & Properties → Binary Phase Diagrams & Lever Rule
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Question
Denoting as liquid and as solid in a phase-diagram with the subscripts representing different phases, a eutectoid reaction is described by
- A.
- B.
- C.
- D.
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Correct answer
(A;D)
Solution
A eutectoid reaction is a solid-state reaction in which one solid phase transforms into two other solid phases upon cooling. The general equation is given by:In the context of the question, where denotes a solid phase, the reaction is:This matches option (A). Option (D) represents a peritectoid reaction. Based on the provided answer key correction, both options (A) and (D) are accepted as correct answers.
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