Add the reaction equation: C + Al2O3 =; K2O + CO =; Fe2O3 + Mg; Na2S + O2; Na2O + C; MnO2 + Al; ZnO + H2; Na2O + CO

1) 2Al2O3 + 9C = Al4C3 + 6CO (when aluminum oxide interacts with carbon, aluminum carbide and carbon monoxide are formed);

2) K2O + CO = no reaction;

3) 3Mg + Fe2O3 = 3MgO + 2Fe (when magnesium interacts with iron oxide, magnesium oxide and iron are formed);

4) Na2S + 2O2 = Na2SO4 (when sodium sulfide interacts with oxygen, sodium sulfate is formed);

5) Na2O + C = no reaction;

6) 3MnO2 + 4Al = 2Al2O3 + 3Mn (when magnesium oxide interacts with aluminum, aluminum oxide and magnesium are formed);

7) ZnO + H2 = Zn + H2O (when zinc oxide interacts with hydrogen, zinc and water are formed);

8) Na2O + CO = no reaction.