Question

Extraction of gold and silver involves leaching with $\text{C}{\text{N}}^{-}$ ion. Silver or gold is later recovered by:

• A. Liquation
• B. Distillation
• C. Zone refining
• D. Displacement with Zn

Answer 1

Answer: (D)

Zinc metal can displace $Ag$ and $Au$ as $Zn$ being more reactive than $Ag$ and $Au$. The following reactions are involved in the extraction of gold or silver from their native ores.
From Native ore,