In the $Bessemer$ and $open-hearth$ process for the manufacture of steel,which one of the following is used for the removal of carbon in part or whole?
$Bessemer \to$ $Open-hearth$

In the manufacture of steel,the Bessemer converter contains a lining of:

Which of the following oxides is not reduced by carbon reduction for its commercial extraction?

$Ni$ anode is used in the electrolytic extraction of

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.

The Ellingham diagram for zinc,magnesium,and carbon converting into corresponding oxides is shown below. At $1100 \, ^oC$,which reaction is spontaneous to a maximum extent?