Identify A and B respectively in the followin | vedclass

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(A) The extraction of gold involves the leaching of gold metal with cyanide ions in the presence of air $(O_2)$ to form the soluble complex $A$:$4 Au_

Vedclass · Accepted Answer

$[Au(CN)_2]^{-} ; [Zn(CN)_4]^{2-}$

Vedclass · Answer

(A) The extraction of gold involves the leaching of gold metal with cyanide ions in the presence of air $(O_2)$ to form the soluble complex $A$:$4 Au_{(s)} + 8 CN^{-}_{(aq)} + 2 H_2O_{(aq)} + O_{2(g)} \longrightarrow 4 [Au(CN)_2]^{-}_{(aq)} (A) + 4 OH^{-}_{(aq)}$Next,the gold is recovered from the complex by displacement with a more electropositive metal like zinc,forming the complex $B$:$2 [Au(CN)_2]^{-}_{(aq)} + Zn_{(s)} \longrightarrow [Zn(CN)_4]^{2-}_{(aq)} (B) + 2 Au_{(s)}$Thus,$A$ is $[Au(CN)_2]^{-}$ and $B$ is $[Zn(CN)_4]^{2-}$.Therefore,option $A$ is the correct answer.

Identify $A$ and $B$ respectively in the following reactions:
$4 Au_{(s)} + 8 CN^{-}_{(aq)} + 2 H_2O_{(aq)} + O_{2(g)} \longrightarrow 4 A_{(aq)} + 4 OH^{-}_{(aq)}$
$2 A_{(aq)} + Zn_{(s)} \longrightarrow B_{(aq)} + 2 Au_{(s)}$

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Identify $A$ and $B$ respectively in the following reactions:$4 Au_{(s)} + 8 CN^{-}_{(aq)} + 2 H_2O_{(aq)} + O_{2(g)} \longrightarrow 4 A_{(aq)} + 4 OH^{-}_{(aq)}$$2 A_{(aq)} + Zn_{(s)} \longrightarrow B_{(aq)} + 2 Au_{(s)}$