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  4. Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :-

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Q. Leaching of gold with dilute aqueous solution of $NaCN$ in presence of oxygen gives complex $[A]$, which on reaction with zinc forms the elemental gold and another complex $[B]. [A]$ and $[B]$, respectively are :-

JEE MainJEE Main 2022General Principles and Processes of Isolation of Elements

Solution:

$Au + NaCN \rightarrow Na \left[ Au ( CN )_{2}\right]$
$Zn + Na \left[ Au ( CN )_{2}\right] \rightarrow Na _{2}\left[ Zn ( CN )_{4}\right]+ Au$