1.

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

Answer»

SOLUTION :The crushed ore of argentite `(Ag_(2)S)` is leached with sodium cyanide solution.This reaction froms sodium argento cyanide Na `[Ag(CN)_(2)]`.
Step1. `Ag_(2)S+4NaCN hArr2Na[Ag(CN)_(2)]+Na_(2)S`
The solution of sodium argento cyanide combines with zinc dust and forms sodium TETRA cyano zincate and precipitated silver.
Step2:`Zn+2Na[Ag(CN)_(2)]toNa2[Zn(CN)_(4)]+2Ag darr`
In the step2,REDOX reaction TAKE place.
` (0)""(2+)`
`Zn "" to ""Zn` (Oxidation)
`(+1)""(0)`
`Ag "to"Ag(REDUCTION)`.


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