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

In the metallurgy of silver metal is leached with a dilute solution of NaCN or KCN in the presence of
air (for O₂) from which the metal is obtained later by replacement:

{Ag}_{2} S + 4 NaCN ⇌ \underset{Sod . dicyanoargentate (I)}{2 Na [Ag ({CN}_{2})] + {Na}_{2} S} 4 {Na}_{2} S + {SO}_{2} + 2 H_{2} O \to 2 {Na}_{2} {SO}_{4} + 4 NaOH + 2 S ↓ 2 Na [Ag (CN)_{2}] + Zn \to \underset{Sod . tetra cyanozincate (II)}{{Na}_{2} [Zn (CN)_{4}] + 2 Ag ↓}

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General Principles And Processes of Isolation Of Elements

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