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Poling process :...

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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Verified by Experts

The correct Answer is:
4
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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