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I don't understand this at all, i thought it just said that it can be extracted using carbon? Can someone please explain?
Using just three taken from the reactivity series:
aluminium - most reactive of the three
iron - least reactive
carbon can be used to extract iron from its oxide as carbon is more reactive than iron
carbon cannot be used to extract aluminium from its oxide as carbon is less reactive than aluminium
But... can aluminium be used to extract iron from its oxide? (over to you)