Blister copper is refined by striring mo...

Blister copper is refined by striring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like `CH_(4))`. This process X is called and the metal contain impurities of Y is _.

X = poling, `Y=cuO_(2)`

X = cupellation, `Y=CuO`

X = cupellation, `Y=ZnO`

X = poling, `Y=Cu_(2)O`

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Blister copper is refined by striring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like `CH_(4))`. This process X is called and the metal contain impurities of Y is _.