Question

With respect to the general phase diagram of two component system. Identify the type of solution formed at the eutectic point.

(a) Regular solution

(b) Steady state solution

(c) Invariant solution

(d) Transition solution

I have been asked this question in a national level competition.

Query is from Application of Phase Rule to One Component System in portion Phase Rule of Engineering Chemistry I

Answer 1

Right option is (a) Regular solution

Explanation: From the general phase diagram, the concentration of the first component with respect to the other decreases till certain point (eutectic point) and then increases gradually such that the other component’s concentration increases together. Thus this is an example of regularity and hence a regular solution is obtained.