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

The inner layer of a blast furnace is made of:

Among the following groups of oxides,the group containing oxides that cannot be reduced by carbon to give the respective metals is

The oxidising and reducing agents respectively for the cyanide extraction of silver from argentite ore are

The plot shows the variation of $- \ln K_p$ versus temperature for the two reactions:
$M_{(s)} + \frac{1}{2} O_{2(g)} \to MO_{(s)}$ and $C_{(s)} + \frac{1}{2} O_{2(g)} \to CO_{(g)}$
Identify the correct statement.

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.