Phase Diagrams $(25$ P$)$

Below shown phase diagram describes the system $Mg-Pb.$

a$)$ Complete the diagram by naming the phases that are present in the marked areas $($boxes $A-F.(6P)$

A:

D:

B:

E:

C$.$

F:

b$)$ At roughly $81wt\%$ of $Pb,M{g}_{2}Pb$ is formed.

Which of the following designations fits best to $M{g}_{2}Pb?(2P)$

Intermetallic compound

Solid solution

Eutectic mixture

Alloy

What is shown by $M$ in above phase diagram $?$

c$)$ Determine composition and mass of the individual phases which are present

in $100$ g of a mixture Mg$-$Pb with $40$ wt$\%$ Pb at $500$ and $300\backslash$deg C$.(8$ P$)$

d$)$ Briefly explain $$solidus line$$ and highlight the solidus line in the phase diagram

Mg$-$Pb$.(3$ P$)$

e$)$ Does the phase diagram Mg$-$Pb comprise eutectic and$/$or eutectoid points $?$

Briefly explain