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The set of metals whose extraction involves hydrometallurgy is

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Hg, Ag, Au

Cu, Ag, Au

Na, Zn, Al

Au, Fe, Cu

answer is C.

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Detailed Solution

Low grade copper ores are converted into CuSO₄, from which Cu is extracted by adding scrap iron to CuSO₄ solution.
Ag and Au are extracted by McArthur-Forrest process which is based on hydrometallurgy.

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