Q19Assertion & reason
How copper is extracted from low grade copper ores? (3)
Show answer
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. + Cu2+ (aq) + H2 (g) → Cu(s) + 2H (aq) Cu2+ + Fe(s) → Fe2+ (aq) + Cu(s) Distribution of marks • Reactions (1 ×2 = 2 marks) • Explanation (1 mark)