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Write the balanced equations for extract...

Write the balanced equations for extraction of silver from glance by cyanide process.

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In case of silver metal, sulphide ore is treated with sodium cyanide. Sodium argentocyanide complex is formed which on treating with zinc metal gives silver.
`Ag_2S+4NaCNto2Na[Ag(CN)_2]+Na_2S`
`2Na[Ag(CN)_2]+ZntoNa_2[Na_2[Zn(CN)_4]+2AgIdarr`
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