Phản ứng (1) :
\(3FeO+2Al\rightarrow Al_2O_3+3Fe\)
\(Fe^{+2}+2e\rightarrow Fe\)
\(Al\rightarrow Al^{+3}+3e\)
Phản ứng (3) :
\(4Fe\left(OH\right)_2+O_2+2H_2O\rightarrow4Fe\left(OH\right)_3\)
\(Fe^{+2}\rightarrow Fe^{+3}+1e\)
\(O_2+4e\rightarrow2O^{2-}\)