Question $2)$ The Chromium$-$Nickel $($Cr$-$Ni$)$ phase diagram is given below as a molar and it is seen that $1$ CrNi$2$ compound is formed in the diagram.

a$)$ Write over the phase regions that are not defined in the phase diagram.

b$)$ the elemental ratios of the phases formed at the point indicated by $"$a$",$ the phase ratios and

calculate the proportions of the types of grains formed.

c$)$ Calculate the elemental ratios of the phases formed at the point indicated by $"$b$",$ the phase ratios and the ratios of the grain types formed.