Question

Which of the following is a peritectic reaction?

• A. Solid$_1$ + Solid$_2$ gives Solid$_3$
• B. Liquid gives Solid$_1$ + Solid$_2$
• C. Solid$_1$ gives Solid$_2$ + Solid$_3$
• D. Liquid + Solid$_1$ gives Solid$_2$

Hint:

Peritectic reactions are three-phase reactions involving a liquid and two solid phases and usually occur at a fixed temperature and composition in phase diagrams.

Answer 1

The Correct Option is D

A peritectic reaction is a type of phase transformation in which, upon cooling, a liquid and a solid phase combine to form a different solid phase.
This can be represented as:
Liquid + Solid$_1$ $⇒$ Solid$_2$
Such reactions are observed in certain binary alloy systems, especially where incongruent melting occurs.
Among the given options, only option (4) represents this behavior correctly.