Poling process:

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all of the above are correct

reduces ${SnO}_{2}$ to $Sn$

oxidises impurities like iron and removes them as scum

uses green poles

answer is D.

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Detailed Solution

Metals with oxidized impurities are purified by poling. Typically, it is employed to clean up metals like copper or tin that are impurely present as copper oxide or tin oxide. The liquid metal is stirred with a still-green log of wood.

Hence, option D is correct.

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