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

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O₂ and CO₂

O₂ and Zn dust

HNO₃ and Zn dust

HNO₃ and CO

answer is B.

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Detailed Solution

The reactions involved in extraction of silver by cyanide process are
Ag₂S+CN⁻+O₂⟶ [Ag(CN)₂] + SO₂...........(i)

[Ag(CN)₂] + Zn ⟶ [ Zn(CN)₄]₂⁻+ Ag........(ii)

In reaction (i), sulphide is oxidised to SO₂ by oxygen.
In the reaction (ii), silver ion (Ag⁺) is reduced to Ag by Zn.
Therefore,O₂ is oxidising agent and Zn is reducing agent.

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