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…
A. X=cupellation, Y=`CuO_(2)`
B. X=poling,Y=`Cu_(2)O`
C. `X=poling, Y=CuO
D. X=Cupellatio, Y=CuO