In the extraction of aluminium

Process $X \,:$ applied for red bauxite to remove iron oxide (chief impurity)

Process $Y\,:$ (Serpeck's process) : applied for white bauxite to remove $Z$ (chief impurity) then, process $X$ and impurity $Z$ are

Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false.

$(i)$  In Gold schmidt thermite process aluminium acts as a reducing agent .

$(ii)$  $Mg$ is extracted by electrolysis of aq. solution of $MgCl_2$

$(iii)$  Extraction of $Pb$ is possible by carbon reduction method

$(iv)$  Red Bauxite is purified by Serpeck's process

Chemical leaching is useful in the concentration of:

In zone – refining method the molten zone

A metal $(M)$ which exists in oxide form and its oxide is not possible to reduce by carbon up to $800\,^oC$ but it is possible to reduce by $Al$ even below $800\,^oC$. Select correct Ellingham diagram for metal $(M)$