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What is meant by hydrometallurgy ?...

What is meant by hydrometallurgy ?

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Hydrometallurgy is the process of extraction of metals. Ore is mixed in a particular chemical reagent. Then, precipitation of metal occurs with the help of more electropositive metal. For example, for precipitation of silver, concentrated argentite (`Ag_2S`) is treated with the solution of NaCN. It forms sodium dicyanoargentate (I). Then, alkaline solution of it is treated with more electropositive metal like Zn or Al to precipitate silver.
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Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.

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