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  • Extraction of gold and silver involves leaching the metal with CN-ion. The metal is recovered by ________________. (i) displacement of metal by some other metal from the complex ion. (ii) roasting of the metal complex.

Extraction of gold and silver involves leaching the metal with CN^- ion. The metal is recovered by ________________.

(i) displacement of metal by some other metal from the complex ion.

(ii) roasting of the metal complex.

(iii) calcination followed by roasting.

(iv) thermal decomposition of the metal complex.

Answers (1)

The answer is the option (i). Extraction of gold and silver involves leaching with CN- ion. The metal in cyanide process is recovered by displacement of metal by some other metal from the complex ion. The reaction taking place is as:

4M+8CN^{-}+2H_{2}O+O_{2}\rightarrow 4[M(CN)_{2}]^{-}+4OH^{-}

                                                     2[M(CN)_{2}]^{-}+Zn\rightarrow [Zn(CN)_{4}]^{2-}+2M

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