QJEEM22Chb2ee: JEE Main 2022 Chemistry - Class 12 JEEM22Chb2ee Solution: In isolation of which one of the following metals from their…

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In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

Accepted Answer

In the extraction of Silver and Gold, NaCN is used to leach the metal.

4 Au(s) + 8 C \overset{―}{N} (a q) + 2 H_{2} O + O_{2} (g)

\to 4 {[A u (C N)_{2}]}^{-} (a q) + 4 O H^{-} (a q)

2 {[Au (CN)_{2}]}^{-} (aq) + Zn \to 2 Au (s) + {[(Zn (CN)_{4})]}^{2 -} (aq)

In case of ore containing ZnS and PbS, the depressant used is NaCN.

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