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प्रश्न
Describe the role of the NaCN in the extraction of silver from silver ore.
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उत्तर
It reacts with the silver ore, Ag2S, (Argentite) to form soluble complex from which silver can be displaced by adding more electropositive metal like Zn
\[\ce{Ag2S + 4NaCN + 2O2<=> 2Na[Ag(CN)2] +Na2SO4}\]
\[\ce{2Na[Ag(CN)2] + Zn -> Na2[2n(CN)4] + 2Ag↓}\]
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