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''The extraction of a metal from its ore...

''The extraction of a metal from its ore is actually the reduction of its compound'' - Justify the statement.

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An ore is a compound of the metal from which it is extracted after its conversion into a oxide. In a metal oxide, obtained after extraction exists in zero oxidation state. This means, the metal ion present in the oxide is converted into a metal by accepting electrons. Thus, it is said that extraction of a metal from its ore is actually the reduction of its compound.
`M^(n+)("metal ion in ore")+n erarr "M (free metal)"`
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