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hydrogen, oxygen and carbon dioxide
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Hydrogen peroxide → water + oxygen
2H₂O₂ → 2H₂O + O₂
Calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide
CaCO3 + 2HCl → CaCl2 + H2O + CO2
zinc + nitric acid → zinc nitrate + hydrogen
Zn + 2HNO3 → Zn(NO3)2 + H2
oxygen production
Hydrogen peroxide → water + oxygen
carbon dioxide production
Calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide
hydrogen production
zinc + nitric acid → zinc nitrate + hydrogen