zinc but not copper is used for the recovery of Ag from [Ag(CN)2]`
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Zinc is very powerful reducing agent and readily displaces silver present in the complex.
Zn+2 [Ag (CN)2]` = [Zn (CN)4]2` +2Ag
Copper is also more reducing than silver but not is so effective. Moreover, Zinc is cheaper than silver.
Zn+2 [Ag (CN)2]` = [Zn (CN)4]2` +2Ag
Copper is also more reducing than silver but not is so effective. Moreover, Zinc is cheaper than silver.
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