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  4. Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like CH4 ). This process X is called and it is used to purify the metal that initially contain impurities of Y. Y is .

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Q. Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like $CH_{4}$ ). This process X is called ________ and it is used to purify the metal that initially contain impurities of Y. Y is _______.

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Solution:

Poling is a purification process which is used for metals which contains their own oxide as impurity.