Among the following metals the number of metals that are extracted by self-reduction method from their respective ores is Hg, Zn, Cu, Al, Mg, Pb, Fe, Na.

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Self-Reduction Process: The cations of the less electropositive metals like Pb, Hg and Cu may be reduced without the use of any additional reducing agent. Self-reduction of Cu: 2 C u 2 O + C u 2 S → 6 C u + S O 2 g It is called self-reducing because copper oxide itself reduced the copper sulfide to give copper and sulfur dioxide. Similar reactions occurs for Pb and Hg.

Among the following metals the number of metals that are extracted by self-reduction method from their respective ores is Hg, Zn, Cu, Al, Mg, Pb, Fe, Na.

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