Give the correct order of initials $\mathrm{T}$ or $\mathrm{F}$ for the following statements. Use $\mathrm{T}$ if statement is true and $\mathrm{F}$ if it is false.
$\left(\mathrm{i}\right)$ In the Gold Schmidt, thermite process aluminium acts as a reducing agent.
$\left(\mathrm{ii}\right)$ $\mathrm{Mg}$ is extracted by electrolysis of an aqueous solution of ${\mathrm{MgCl}}_2$.
$\left(\mathrm{iii}\right)$ Extraction of $\mathrm{Pb}$ is possible by carbon reduction of $\mathrm{PbO}$ in smelting.
$\left(\mathrm{iv}\right)$ Red bauxite is purified by Serpeck's process.