devarshi-dt-logo

Question:

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

O2andCO, respectively

HNO3andCO, respectively

O2andZndust, respectively

HNO3andZndust, respectively

Solution:

In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are O2 and Zn dust respectively.
Reactions are:
Ag2S + 2CN⁻ + O2 → 2[Ag(CN)2]⁻ + SO2
Zn + 2[Ag(CN)2]⁻ → [Zn(CN)4]²⁻ + 2Ag
Option B is correct.