The correct statement(s) related to the metal extraction processes is (are): (a) A mixture of \(...

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The correct statement(s) related to the metal extraction processes is (are):
(a) A mixture of \( \mathrm{PbS} \) and \( \mathrm{PbO} \) undergoes self reduction to produce \( \mathrm{Pb} \) and \( \mathrm{SO}_{2} \).
(b) In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
(c) Partial oxidation of sulphide ore of copper by roasting, followed by self reduction produces blister copper.
(d) In cyanide process, zinc powder is utilized to precipitate gold from \( \mathrm{Na}\left[\mathrm{Au}(\mathrm{CN})_{2}\right] \).
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