The ellingham diagram of a certain metal $M$ is represented in the figure the point $A$ and $B$ respectively correspond to

In metallurgical process of aluminium, cryolite is mixed with alumina in its molten state, because it

Hall-Herolut’s process is given by

Which of the following is used as a depressant in the separation of $ZnS$

Consider following reactions of metallurgy :

Ore  $'X'\xrightarrow{{Roasting}}\ 'Y'\, + S{O_2} \uparrow $

Ore  $'Z'\xrightarrow{{Calcination}}\ 'Y'\, + C{O_2} \uparrow $

$'Y' + C\xrightarrow{{1673\,K}}A(vapour) + {B_{(g)}}$

where $'A'$ and $'B'$ are respectively