K+OH2 CaO NaCe+Br2 Na2Co3+KCL NaOH+HBr Za(OH)2 MgSo4+Zn

2K + 2H2O → 2KOH + H2; CaO + H2O → Ca(OH)2; Br2 + 2NaCl → 2NaBr + Cl2; Na2CO3 + 2KCl → 2NaCl + K2CO3; NaOH + HBr → NaBr + H2O; Zn + 2H2O → Zn(OH)2 + H2; Mg + ZnSO4 → MgSO4 + Zn