Question

Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is
extracted from it by electrolytic reduction

Mention one reason for the use of aluminium in thermite welding ?

Answer 1

In Aluminium thermite welding, the reduction with aluminium is highly exothermic and
heat generated is sufficient to melt the metal.

`Fe_2O_3 + 2Al ⟶ 2Fe + Al2O_3 + Heat`