Which catalyst is used in the industrial manufacture of hydrogen gas?

Which of the following options is correct according to the reactivity of metals?

$(a)$ Consider the following chemical equation:
$Fe_{2}O_{3} + 2Al \rightarrow Al_{2}O_{3} + 2Fe$
Name two categories in which you can place this reaction.
$(b)$ Define the term 'Oxidation' of a substance and name the substance oxidised and the oxidising agent in the above reaction.

Which of the following reactions does $NOT$ occur during the extraction of iron in a blast furnace?

During the extraction of iron from hematite in a blast furnace,which substance is obtained as slag?

Which non-metal element is found in a gaseous state at room temperature?