"Hydro metallurgy" method is used for the extraction of the following metals :

Z n & A g

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A g & A u

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Z n & H g

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H g & C u

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Solution

The correct option is B $A g & A u$
Hydro metallurgy or Precipitation by more electropositive metal.
It is the process in which more electropositive metal displaces less electropositive metal from its aqueous solution state.
Ag and Au are reduced by hydro metallergical process.

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