The chemical reactions taking place inside blast furnance during the manufacture. of !iron is given b6low. Analyse it and answer the questions given below.
`CaCO_3(s) to CaO(s)+CO_2(g)`
`CaO(s)+SiO_2(s) to CaSiO_3(s)`
`C(s)+O_2(g) to CO_2(g)`+Heat
`CO(g)+C(s)`+Heat `to 2CO(g)`
`Fe_2O_3(s)+3CO(g) to 2Fe(s)+3CO_2(g)`
Write the chemical formula of the ore of iron.

Answer

`Fe2O3`