Discussion
Match the invariant reactions in Column I with the names in Column II (L is liquid phase, and α, β, γ are solid phases). All reactions proceed to the right on cooling.
| Column I | Column II |
|---|---|
| (P) L ⇄ α + β | (1) Monotectic |
| (Q) L + α ⇄ β | (2) Peritectoid |
| (R) γ ⇄ α + β | (3) Peritectic |
| (S) α + β ⇄ γ | (4) Eutectoid |
| (5) Eutectic |
Answer: B
The match is P-5, Q-3, R-4, S-2.
- (P) L → α + β: a liquid gives two solids on cooling, the eutectic reaction.
- (Q) L + α → β: a liquid and a solid combine into a new solid, the peritectic reaction.
- (R) γ → α + β: the solid-state analogue of the eutectic, the eutectoid reaction (as in steel, austenite to ferrite and cementite).
- (S) α + β → γ: two solids combine into one, the solid-state analogue of the peritectic, the peritectoid.
A monotectic is L1 → L2 + α, a liquid splitting into a second liquid and a solid, which matches none of the four reactions; options that use it for Q are therefore wrong.
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