Question

What is peritectic?

(a) A reaction between solid phase and gas phase to form a second solid phase

(b) A reaction between solid phase and liquid phase to form a second solid phase

(c) A reaction between gas phase and liquid phase to form a second solid phase

(d) A reaction between solid phase and liquid phase to form a second liquid phase

I had been asked this question in semester exam.

The origin of the question is Solid Liquid Equilibrium topic in chapter Contact Equilibrium Separation Process of Food Processing Unit Operations

Answer 1

The correct option is (b) A reaction between solid phase and liquid phase to form a second solid phase

The explanation: A reaction between solid phase and liquid phase to form a second solid phase is called peritectic reaction. These reactions are slow as the product phase form at the boundary between the two reacting phases thus it separates them and slows down the further reaction.