Name of the process is cyanide process, in which we added Zn to soluble $[A g (C N)_{2}]^{-}$ to get Ag. If true enter 1 else 0.

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Solution

Process of extraction of $A g$ (silver) is called cyanide process as sodium cyanide solution is used. The ore is crushed, concentrated and then treated with $N a C N$ solution. The reaction forms sodium-argento cyanide.
$A g S + N a C n ⇌ 2 N a [A g (C N)_{2}] + N a_{2} S$
This solution of sod. argento cyanide combines with $Z n$ -dust and forms sod-tetracyano zincate and silver is precipitated out.
$Z n + 2 N a [A g (C N)_{2}] ⟶ N a_{2} [Z n (C N)_{4}] + 2 A g$
Hence, 1.

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