CO2 + NaOH = Na2CO3 + H2O

H2O = H2 + O2↑

Zn + HCl = ZnCl2 + H2↑

ZnO + H2SO4 = ZnSO4 + H2O

HgO = Hg + O2

H2SO4 + KOH = K2SO4+H2O

H2 + O2 = H2O

Na + H2SO4 =Na2SO4+H2↑
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