mia4469 mia4469

14-05-2023
Chemistry

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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

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