The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is:

Which of the following statements is not correct?
$1$. Reduction of alumina to give aluminium by magnesium is thermodynamically feasible.
$2$. The point of intersection of $Al_2O_3$ and $MgO$ curves in Ellingham diagram is below $1665 \ K$.
$3$. Use of magnesium as reducing agent in metallurgy of aluminium is economical.
$4$. Ellingham diagram represents the graphical plot of Gibbs energy vs temperature for the formation of the oxides of common metals and reducing agents.

Blister copper is extracted from copper pyrites. After removal of slag $FeSiO_3$,blister copper is obtained by

Roasted copper pyrite on smelting with sand produces

In the extraction of iron,the reaction which occurs at $900-1500 \ K$ in the blast furnace is:

Suggest a list of metals that are extracted electrolytically.