Which of the substances does iron react with? 1) H2SO4 2) CO2 3) NA2O 4) O2

The correct answer, or rather the answers, is that iron will react with sulfuric acid (H2SO4) and oxygen (O2). Of course, under certain conditions and using catalysts, it is possible to react iron with carbon dioxide (CO2). But under normal conditions this is not possible.



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