How is pure chromium metal prepared?
A) By exothermic reaction of chromium (VI) oxide,obtained from aluminum ore,with steel
B) By endothermic reaction of chromium (III) oxide,obtained from chromite ore,with aluminum
C) By endothermic reaction of chromium (II) oxide,obtained from iron ore,with copper
D) By exothermic reaction of chromium (III) oxide,obtained from chromite ore,with aluminum
E) By endothermic reaction of chromium (VI) oxide,obtained from aluminum ore,with brass
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