Isolation Of Elements

\(C{r_2}{O_3} + 2Al \to A{l_2}{O_3} + 2Cr\)

\(2A{l_2}{O_3} + 3C \to 4Al + 3C{O_2}\)

\(FeO + CO \to Fe + C{O_2}\)

\(2{\left[ {Au{{\left( {CN} \right)}_2}} \right]^ - }_{\left( {aq} \right)} + Zn\left( s \right) \to 2Au\left( s \right) + {\left[ {Zn\left( {C{N_4}} \right)} \right]^{2 - }}\)