1.

Describe the role of the following : NaCN in the extraction of silver from a silver ore.

Answer»

Solution :In this method, the silver ORE is concentrated by CHEMICAL reaction with sodium cyanide which dissolves silver.
`{:(Ag_(2)S+4NaCN to 2Na[Ag(CN)_(2)]+Na_(2)S),(" SIVER sulphideSodium argentocyanide "):}`
Sodium argentocyanide is treated with zinc metal to OBTAIN pure silver metal.
`2Na[Ag(CN)_(2)] +Zn to 2Ag+ Na_(2)[Zn(CN)_(4)]`.


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