Iron oxide - Wikipedia

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Iron (III) oxide reacts with carbon monoxide to form solid iron and carbon dioxide. What mass (in grams) of carbon dioxide is produced from 12.4 g of iron (III) oxide? - Quora

Iron oxide - Wikipedia

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I put my grinder in a mixture of hydrogen peroxide and salt, it came out black and full of gunk as a result, it was silver before, can anyone explain this?