Which metal is added to recover $Au$ from $[Au(CN)_2]^-$?

  • A
    $Zn$
  • B
    $Cu$
  • C
    $Fe$
  • D
    $Ag$

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In the extraction of silver,$Ag_2S$ is dissolved in :

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Upon heating with $Cu_2S$,the reagent$(s)$ that give copper metal is/are:
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$(B)$ $CuO$
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