Pb + 2NaOH -> Na2PbO2 + H2FeSO4 + CuO -> Fe2O3 + CuSO42Na + Ca(NO3)2 -> 2NaNO3 + CaFe + 2KOH -> K2FeO2 + H2NiCl2 + 2Al -> 2AlCl3 + Ni
Pb + 2NaOH -> Na2PbO2 + H2
FeSO4 + CuO -> Fe2O3 + CuSO4
2Na + Ca(NO3)2 -> 2NaNO3 + Ca
Fe + 2KOH -> K2FeO2 + H2
NiCl2 + 2Al -> 2AlCl3 + Ni