8. Electrolysis does not remove which of the following metals? a) Na b) Mg c) Al d) Fe
Answer: d Explanation: In reality, choosing the right reducing agent is crucial to extracting a metal from its ore. Because iron is a fairly active metal, its oxides can be reduced with carbon rather than electrolysis. Electrolysis is used to recover reactive metals like aluminium, while reduction with carbon is used to extract less reactive metals like iron.
