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प्रश्न
Extraction of gold and silver involves leaching the metal with CN– ion. The metal is recovered by ______.
पर्याय
displacement of metal by some other metal from the complex ion.
roasting of metal complex.
calcination followed by roasting.
thermal decomposition of metal complex.
उत्तर
Extraction of gold and silver involves leaching the metal with CN– ion. The metal is recovered by displacement of metal by some other metal from the complex ion.
Explanation:
The metal in cyanide process is recovered by displacement of metal by some more reactive metal from the complex.
The metal is later recovered by displacement method.
\[\ce{4M + 8CN^{-} + 2H2O + O2 -> 4[M(CN)2]^{-} + 4OH^{-}}\]
\[\ce{2[M(CN)2]^{-} + Zn -> [Zn(CN)4]^{2-} + 2M}\]
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