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Write the equation for the extraction of...

Write the equation for the extraction of silver by leaching with sodium cyanide and show that the leaching proces is a redox reaction.

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`Ag_(2)S + 4NaCN rarr 2Na[Ag(CN)_(2)] + Na_(2)S`
`2Na[Ag(CN)_(2)] + Zn rarr Na_(2)[Zn(CN)_(4)] + 4g`
(i) Silver is leached with an aqueous solution of NaCN to form soluble sodium dicyano argentite.
(ii) Silver is recovered from dicyano argentite. Silver is reduced to its elemental state.
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