Which of the following metals cannot be extracted via hydrometallurgy?

Which of the following metals cannot be extracted via hydrometallurgy? Correct Answer Iron

For hydrometallurgy, the ore needs to be able to dissolve in a reagent and the metal should form a soluble complex. Copper, gold and silver ores are more suitable to be obtained via hydrometallurgy and iron is usually obtained via the blast furnace.
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