mia4469 mia4469 14-05-2023 Chemistry contestada 22. Which is a redox reaction? 1) CaCO3 → CaO + CO2 2) NaOH + HCl → NaCl + H₂O 3) 2 NH4Cl + Ca(OH)2 → 2 NH3 + 2 H₂O +CaCl2 4) 2 H₂O → 2 H2 + O2
