\(a,\left(1\right)4Na+O_2\underrightarrow{t^o}2Na_2O\\ \left(2\right)Na_2O+H_2O\rightarrow2NaOH\\ \left(3\right)2Na+2H_2O\rightarrow2NaOH+H_2\)
\(b,\left(1\right)4P+5O_2\underrightarrow{t^o}2P_2O_5\\ \left(2\right)P_2O_5+3H_2O\rightarrow2H_3PO_4\\ c,\left(1\right)Mg+2HCl\rightarrow MgCl_2+H_2\\ \left(2\right)2H_2+O_2\underrightarrow{t^o}2H_2O\\ \left(3\right)H_2O+SO_3\rightarrow H_2SO_4\\ \left(4\right)H_2SO_4+Zn\rightarrow ZnSO_4+H_2\\ \left(5\right)H_2+FeO\underrightarrow{t^o}Fe+H_2O\)
\(d,\left(1\right)2H_2O\underrightarrow{dp}2H_2+O_2\\ \left(2\right)H_2+FeO\underrightarrow{t^o}Fe+H_2O\\ \left(3\right)3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\\ e,\left(1\right)2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\\ \left(2\right)2Ca+O_2\underrightarrow{t^o}2CaO\\ \left(3\right)CaO+H_2O\rightarrow Ca\left(OH\right)_2\)
