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.

Question

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.

TestHub · Accepted Answer

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:
$2 C u_{2} O + C u_{2} S \to 6 C u + S O_{2} (g)$
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.

Chemistry - General Principles and Processes of Isolation of Metals Question with Solution | TestHub

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