4Na + O2 = 2Na2O
Ca + 2H2O = Ca(OH)2 + H2
Mg(OH)2 + H2SO4 = MgSO4 + 2H2O
Fe + 2HCl = FeCl2 + H2
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4Na + O2 = 2Na2O
Ca + 2H2O = Ca(OH)2 + H2
Mg(OH)2 + H2SO4 = MgSO4 + 2H2O
Fe + 2HCl = FeCl2 + H2