Which of the following metals are extracted from its ore by using self-reduction method?

Copper

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Mercury

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Lead

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Silver

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Solution

The correct options are
A Copper
B Mercury
C Lead
Copper, mercury and lead are extracted from its ore by using self-reduction method. For example, the commercial metallurgical process for the formation of metallic copper from the sulphide ore involves oxidation of $C u_{2} S$ to $C u_{2} O$ and auto reduction of a mixture of $C u_{2} S$ and $C u_{2} O$ to copper metal.
$C u_{2} S + \frac{3}{2} O_{2} \to C u_{2} O + S O_{2}$
$2 C u_{2} O + C u_{2} S \to 6 C u + S O_{2}$

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