Aluminium is used as a reducing agent in the reduction of

The main reactions occurring in a blast furnace during the extraction of iron from haematite are $....$.
$(i)$ $Fe_2O_3 + 3CO \to 2Fe + 3CO_2$
$(ii)$ $FeO + SiO_2 \to FeSiO_3$
$(iii)$ $Fe_2O_3 + 3C \to 2Fe + 3CO$
$(iv)$ $CaO + SiO_2 \to CaSiO_3$

During the metallurgy of aluminium,bauxite is dissolved in cryolite $(Na_3AlF_6)$ because:

Smelting is termed to the process in which

Which is the most impure form of iron?

Flux is used to remove