The MacArthur-Forrest process is used for the extraction of:

C u

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A g

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F e

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Z n

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Solution

The correct option is B $A g$
The MacArthur-Forrest process is a metallurgical technique for extracting gold and silver from low-grade ore by converting the gold to a water-soluble coordination complex.

The reactions are:
$4 A g (s) + 8 C N^{-} (a q) + 2 H_{2} O (a q) + O_{2} (g) \to 4 [A g (C N)_{2}]^{-} (a q) + 4 O H^{-} (a q)$
$2 [A g (C N)_{2}]^{+} + Z n (s) \to [Z n (C N)_{4}]^{2 -} (a q) + 2 A g$

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Similar questions

P b, A u, M g, S n, F e, A l, A g, H g, N a, Z n, C u, C a

N a [A g (C N)_{2}]

The standard reducation potentials of

$Z n^{2 +} | Z n, C u^{2 +} | C u$ and $A g^{+} | A g$

are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed.

a) $Z n | Z n^{2 +} | | C u^{2 +} | C u$

b) $Z n | Z n^{2 +} | | A g^{+} | A g$

c) $C u | C u^{2 +} | | A g^{+} | A g$

What is the correct order $E {^{0}}_{c e l l}$ of these cells?

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