1.

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

Answer»

roasting of metal complex
calcination followed by roasting
thermal decomposition of metal complex
displacement of metal by some other metal from the complex ion

Solution :`2M+ 4NaCb_((aq)) overset(O_(2))to 2Na[M(CN)_(2)]+2NaOH`
`2Na[M(CN)_(2)]+ Zn overset(O_(2))to Na_(2)[Zn(CN)_(4)]+2M`


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