Aluminum ores are treated with base to separate the aluminum from iron compounds. Which of the following chemical properties is important in this separation?
A) Aluminum is more easily oxidized than is iron.
B) The iron is reduced to the solid metal in basic solution.
C) Aluminum sulfide decomposes in basic solution, but iron sulfide does not.
D) Aluminum oxide is amphoteric and dissolves in base.
E) none of these
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