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During the cyanide leaching of silver from argentite, which substances act as the oxidizing agent and the reducing agent, respectively?

1. O2 and CO respectively
2. O2 and Zn dust respectively
3. HNO3 and Zn dust respectively
4. HNO3 and CO respectively

Correct answer: O2 and Zn dust respectively

Solution

In the cyanide leaching process, oxygen (O2) acts as the oxidizing agent by facilitating the oxidation of silver ions, while zinc dust (Zn) serves as the reducing agent, helping to reduce silver ions back to metallic silver.

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