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Cyanide or Macarthur Forrest Process

In cyamide ex...

Question

In cyamide extraction process of silver from argentite ore, the oxidising and reducing agents are respectively.

O_{2}

and

C O_{2}

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O_{2}

and

Z n

dust

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H N O_{3}

and

Z n

dust

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H N O_{3}

and

C O

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Solution

The correct option is D $O_{2}$ and $Z n$ dust
The extraction of silver involves in cyanide process are
(i) $A g_{2} S + 2 C N^{-} + O_{2} \to 23 [A g (C N)_{2}]^{-} + S O_{2}$
(ii) $[A g (C N)_{2}]^{-} + Z n \to [Z n (C N)_{4}]^{2 -} + A g$
Thus, in (i) $O_{2} - a c t$ as oxidising agent (oxidise sulphide to $S O_{2})$ and in (ii) $Z n$ act as reducing agent (reduce $A g^{+}$ to $A g$ ).

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