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3Fe2++NO3-+4H+===3Fe3+NO+2H2O
2Fe2++2H++NO3-=2Fe3++H20+NO2 亜鉄イオン水素イオン硝酸イオン三価鉄イオン水二酸化窒素 硝酸は酸化性で酸化鉄イオンを正三価に酸化し、還元物は二酸化窒素 (それは規則です! )
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