(A) Metals with high affinity for oxygen,such as $Al$,$Mg$,and $Ca$,form very stable oxides. $Al_2O_3$ cannot be reduced to metal by carbon because al

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(A) Metals with high affinity for oxygen,such as $Al$,$Mg$,and $Ca$,form very stable oxides. $Al_2O_3$ cannot be reduced to metal by carbon because aluminum has a higher affinity for oxygen than carbon does at moderate temperatures. Instead of reduction,aluminum reacts with carbon at very high temperatures to form aluminum carbide $(Al_4C_3)$.