Poling is employed in the refining of:

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(D) Poling is a metallurgical process used to remove oxide impurities from molten metals. It is specifically used for metals like $Cu$ (copper) and $S

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Both $b$ and $c$

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(D) Poling is a metallurgical process used to remove oxide impurities from molten metals. It is specifically used for metals like $Cu$ (copper) and $Sn$ (tin) where the metal oxide is dissolved in the molten metal. In this process,the molten metal is stirred with green wood poles. The hydrocarbons from the wood reduce the metal oxide to the pure metal.

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