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Poling process `:`

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Poling process `:`
A. reduces `SnO_(2)` to `Sn`.
B. involves the liberation of reducing gases like hydrocarbons.
C. uses poles of freshely cut green wood
D. .all of the above are correct.
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This method is used for the purificationo of those impure metals which contain the impurities of their own impurities for examples `CuO` in Cu and SnO in Sn.
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