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Metallurgy — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryMetallurgy2 Marks
Question
What is Cementation?
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Answer

Gold can be recovered by reacting the deoxygenated leached solution with zinc. In this process the gold is reduced to its elemental state (zero oxidation sate) and the process is called
$Zn ( s )+2\left[ Au ( CN )_2\right]^{-}( aq ) \rightarrow\left[ Zn ( CN )_4\right]^{2-}( aq )+2 Au ( s )$

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