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(C) The carbon reduction process is generally used for metals with moderate electropositivity,such as $Zn, Fe,$ and $Sn$.Metals like $Al$ and $Mg$ are

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$MgO, Al_2O_3$

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(C) The carbon reduction process is generally used for metals with moderate electropositivity,such as $Zn, Fe,$ and $Sn$.Metals like $Al$ and $Mg$ are highly electropositive and have a very high affinity for oxygen.Their oxides ($Al_2O_3$ and $MgO$) are extremely stable and cannot be reduced by carbon at standard commercial temperatures.While $MgO$ can be reduced by carbon at extremely high temperatures (around $2000^{\circ} C$),it is not considered a commercially viable process due to the high energy requirements and technical difficulties.Therefore,carbon reduction is not commercially applicable for $Al_2O_3$ and $MgO$.

Carbon reduction process is not commercially applicable for which of the following set of oxides to extract the respective metal?
$(I)$ $ZnO$,$(II)$ $Fe_2O_3$,$(III)$ $Al_2O_3$,$(IV)$ $SnO_2$,$(V)$ $MgO$

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Carbon reduction process is not commercially applicable for which of the following set of oxides to extract the respective metal?$(I)$ $ZnO$,$(II)$ $Fe_2O_3$,$(III)$ $Al_2O_3$,$(IV)$ $SnO_2$,$(V)$ $MgO$