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Decreasing oxidation number is called ad reduction. Generally metals are available in ore form when we reduce the ore than we getting pure metal. the Oxidation number of pure metal is zero where as the Oxidation number of metal in ore is more than 1.
example extraction of iron from its ore hematite Fe2O3
Fe2O3 + 3CO → 2Fe + 3CO2
0 0 0
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