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प्रश्न
How is copper extracted from low grade copper ores?
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उत्तर
Copper is extracted by hydrometallurgy from low grade copper ores. It is leached out using acid or bacteria. The solution containing Cu2+ is treated with scrap iron, Zn or H2.
\[\ce{Cu^{2+} (aq) + H2 (g) -> Cu(s) + 2H^{+} (aq)}\]
\[\ce{Cu^{2+} (aq) + Fe(s) -> Cu(s) + Fe^{2+} (aq)}\]
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