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What is cementation ?...

What is cementation ?

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(i) Gold can be recovered by reaching the deoxygenated leached solution with zinc.
(ii) In this process the gold is reduced to its elemental state (zero oxidation sate) and
`Zn_((s)) + 2[Au(CN)_(2)]_((aq))^(-) rarr [Zn(CN)_(4)]_(2(aq))^(-) + 2Au_((s))`
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