Describe the reaction occurring in the blast furnace at the lower temperature range.

$AgCl$ on fusion with sodium carbonate,gives

In the manufacture of metallic sodium by the fused salt electrolysis $(Down's \ process)$,a small amount of calcium chloride is added to:

In the alumino-thermite process,what does $Al$ act as?

The reactions which occur in a blast furnace at $500-800 \ K$ during the extraction of iron from haematite are:
$(i)$ $3 Fe_2O_3 + CO \rightarrow 2 Fe_3O_4 + CO_2$
$(ii)$ $Fe_2O_3 + 3 C \rightarrow 2 Fe + 3 CO$
$(iii)$ $Fe_3O_4 + 4 CO \rightarrow 3 Fe + 4 CO_2$
$(iv)$ $Fe_2O_3 + CO \rightarrow 2 FeO + CO_2$

Consider the following reactions:
$2 \, XS + 3 \, O_2 \xrightarrow{\Delta} 2 \, XO + 2 \, SO_2$
$2 \, XO + XS \xrightarrow{\Delta} 3 \, X + SO_2$
Then $X$ can not be