Which of the following can be obtained by hydrometallurgy :

Copper

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Gold

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Silver

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All of these

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Solution

The correct option is C All of these
Hydrometallurgy is a method for obtaining metals from their ores. It is a technique within the field of extractive metallurgy involving the use of aqueous chemistry for the recovery of metals from ores, concentrates, and recycled or residual materials.

Hydro metallurgy : (Ag, Au, Cu) – This is wet metallurgy process.
$C u \to P y r o + H y d r o$
$A g$ and $A u \to$ By cynide process

Steps are : (i) Complex formation (ii) Metal displacement

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