Answer:
Zinc is a very powerful reducing
agent and readily displaces silver present in the complex.
\[Zn+2\,{{[Ag\,{{(CN)}_{2}}]}^{-}}\xrightarrow{\,}\,\underset{\text{Soluble}}{\mathop{{{[Zn{{(CN)}_{4}}]}^{2-}}}}\,+\underset{\text{(ppt}\text{.)}}{\mathop{2Ag}}\,\]
No doubt copper is also more
reducing than silver but is not so effective as zinc. Moreover, zinc is cheaper
than copper.
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