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Question

Write the chemical reactions involved in the extraction of metallic silver from argentite.

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Solution

Silver is extracted from argentite ore by cyanide process.In case of silver metal, the sulphide ore is treated with sodium cyanide. Sodium argentocyanide complex is formed which on treating with zinc metal gives silver.

Ag2S+4NaCN2Na[Ag(CN)2]+Na2S

2Na[Ag(CN)2]+ZnNa2(CN)4]soluble+2AgPpt.

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