Extraction of gold Au involves the formation of complex ions X and Y-Gold ore HO-XY-Au X and Y respectively are -

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Cyanide or Macarthur Forrest Process

Extraction of...

Question

Extraction of gold (Au) involves the formation of complex ions X and Y.
Gold ore $R o a s t i n g - -------- \to C N^{-}, H_{2} O, O_{2} H O^{-} + X Z n - \to Y + A u$
X and Y respectively are :

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

and

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

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

and

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

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

and

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

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

and

Z n {(C N)}_{3}^{-}

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Solution

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(A u)

X

Y

R o a s t i n g - ---------- \to C N^{-}, H_{2} O, O_{2} H O^{-} +^{'} X^{'} Z n - ------------ \to^{'} Y^{'} + A u

X

Y

roasted gold ore + C N^{-} + H_{2} O O_{2} - \to [X] + O H^{-}

[X] + Z n \to [Y] + A u

[X]

[Y]

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

+ C N_{(a q)}^{-} + H_{2} O_{2} [X] + [O H^{-}]

[X] + Z n \to [Y] + A u

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

Identify the complexes [X] and [Y].

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