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 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 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 __________.

Mark the correct statements. (i) Mercury can be refined by the process of distillation. (ii) In poling, the molten impure metal is stirred with green poles of wood. (iii) In electrolytic refining of metals , impure metal is made as cathode and a thin strip of pure metal is made as anode.