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  4. From low grade ores, copper is extracted by

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Q. From low grade ores, copper is extracted by

Solution:

From low grade ore, copper is leached out using acid or bacteria. Solution containing $Cu^{2+}$ is treated with scrap iron or $H_2$
$Cu^{2+} (aq) + H_2(g) \rightarrow Cu(s) + 2H^+(aq)$