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

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Solution

In cyanide extraction process of silver from argentite ore, the oxidising agent is $O_{2}$ and the reducing agent is $Z n$ dust.
$4 Roasted gold ore + 8 C N^{-} + O_{2} (g) + 2 H_{2} O (a q) \to [A u (C N)_{2}]^{-} (a q) + 4 O H^{-} (a q)$
$2 [A u (C N)_{2}]^{-} (a q) + Z n (s) \to [Z n (C N)_{4}]^{2 -} (a q) + 2 A u (s)$

Hence, option (b) is correct.

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

In cyanide extraction process of silver from argentite ore, the oxidising agent is O2 and the reducing agent is Zn dust. 4 Roasted gold ore +8CN−+ O2(g) + 2H2O(aq)→[Au(CN)2]−(aq)+4OH−(aq) 2[Au(CN)2]−(aq)+Zn(s)→[Zn(CN)4]2−(aq)+2Au(s) Hence, option (b) is correct.