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Cyanide or Macarthur Forrest Process

In the proces...

Question

In the process of extraction of gold,
$R o a s t e d g o l d o r e + C N^{-} + H_{2} O_{2} [X] + O H^{-}$
$[X] + Z n ⟶ [Y] + A u$

X =

[A u (C N)_{2}]^{-}

, Y =

[Z n (C N)_{4}]^{2 -}

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X =

[A u (C N)_{4}]^{3 -}

, Y =

[Z n (C N)_{4}]^{2 -}

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X =

[A u (C N)_{2}]^{-}

, Y =

[Z n (C N)_{6}]^{4 -}

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X =

[A u (C N)_{4}]^{-}

, Y =

[Z n (C N)_{4}]^{2 -}

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Solution

The correct option is A X = $[A u (C N)_{2}]^{-}$ , Y = $[Z n (C N)_{4}]^{2 -}$
Crude metal Au is treated with cyanide in the presence of air and water.

$A u + 2 C N^{-} H_{2} O, O_{2} - ---- \to [A u (C N)_{2}]^{-}$

$2 [A u (C N)_{2}]^{-} + Z n ⟶ [Z n (C N)_{4}]^{2 -} + 2 A u$

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