1)
\(4Fe+3O_{2\left(dư\right)}\xrightarrow[]{t^o}2Fe_2O_3\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(FeCl_3+3KOH\rightarrow Fe\left(OH\right)_3\downarrow+3KCl\)
\(2Fe\left(OH\right)_3\xrightarrow[]{t^o}Fe_2O_3+3H_2O\)
\(Fe_2O_3+CO\xrightarrow[]{500-600^oC}2FeO+CO_2\)