Autoreduction process is used in metallurgy of

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TestHub · Accepted Answer

Autoreduction (or self-reduction) is used for less electropositive metals like Cu, Hg, Pb, and Sb. Their sulfide ores are partially roasted to form oxides, which then react with the remaining sulfide to produce the metal and SO₂.

For example, for copper:

$2 C u_{2} S (s) + 3 O_{2} (g) \to 2 C u_{2} O (s) + 2 S O_{2} (g)$

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

For mercury:

$2 H g S (s) + 3 O_{2} (g) \to 2 H g O (s) + 2 S O_{2} (g)$

$2 H g O (s) + H g S (s) \to 3 H g (l) + S O_{2} (g)$

Therefore, Cu and Hg are correct.

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