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Write the equation for the extraction of silver by leaching with sodium cyanide and show that the leaching process is a redox reaction.

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The crushed ore of argentite (Ag2S) is leached with sodium cyanide solution. This reaction forms sodium argento cyanide Na[Ag(CN)2]

Step 1:

Ag2S + 4NaCN ⇌ 2Na[Ag(CN)2] + Na2

The solution of sodium argento cyanide combines with zinc dust and forms sodium tetra cyano zincate and precipitated silver.

Step 2: 

Zn + 2Na[Ag(CN)2] → Na [Ag(CN)2] + 2 Ag↓ In the step 2, redox reaction take place.

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