Blister copper is refined by stirring moltem impure metal with green logs of wood because such a wood liberated hydrocarbon gases like `(CH_(4))`. The process X is called _____ and the Metal contains impurity of Y is ____:

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 the metal contains impurities of Y is __________ .

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 the metal contains impurities of Y is __________ .

Blister copper is refined by stirring molte impure metal with green logs of wood because such a wood liberates hydrogen gases (like CH_(4)) . This process X is called…..and the metal contains impurities of Y is…

During polling, heat of molten metal makes the green logs of wood to liberate __________.

In order to refine 'blister copper’it is melted in a furnace and is stirred with green logs of wood. The purpose is