1.

Give balanced equations for the following. "Extraction of silver from silver glance by cyanide process".

Answer» In case of silver metal, the sulphide ore is treated with sodium cyanide. Sodium argentocynade complex is formed, which on treating with zinc metal gives silver.
`Ag_(2)S + 4NaCN rarr 2N[Ag(CN)_(2)] + Na_(2)S`
`2Na[Ag(CN)_(2)] + Zn rarr underset ("Soluble") (Na_(2)[Zn(CN)_(4)]) + underset ("ppt")(2 Ag) darr`.


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