HCl + NaOH = NaCl + H2O
CaO + H2SO4 = CaSO4 + H2O
CuSO4 + Zn = ZnSO4 + Cu
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HCl + NaOH = NaCl + H2O
CaO + H2SO4 = CaSO4 + H2O
CuSO4 + Zn = ZnSO4 + Cu