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Write the chemical reactions involved th...

Write the chemical reactions involved the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

Text Solution

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(i) Gold is usually found in native state.
(ii) The leaching process is intended to concentrate the gold metal.
`4 Au_((s)) + 8NaCN_((aq))^(-) + 2H_(2)O_((aq)) + O_(2(g)) rarr 4Na[Au(CN)_(2)]_((aq))^(-) + 4NaOH_((aq))^(-)`
`2Na[Au(CN)_(2)] + Zn rarr Na_(2)[Zn(CN)_(4)] + 2Au darr`
(iii) In this reaction, Zn acts as a reducing agent.
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