A) silver
B) copper
C) iron
D) sodium
Correct Answer: A
Solution :
Silver metal is extracted by cyanide process. \[\underset{\text{argentite}}{\mathop{A{{g}_{2}}S}}\,+4NaCN\underset{\text{sodium}\,\text{argentocyanide}}{\mathop{2Na[Ag{{(CN)}_{2}}]}}\,\] \[+\,N{{a}_{2}}S\] \[2Na[Ag{{(CN)}_{2}}]+Zn\to \underset{\begin{smallmatrix} \text{sodium}\,\text{tetracyano} \\ \,\,\,\,\,\,\,\,\,\,\,\,\text{zincate(II)} \end{smallmatrix}}{\mathop{N{{a}_{2}}[Zn{{(CN)}_{4}}]}}\,\,+\underset{\text{ppt}\text{.}}{\mathop{2Ag\downarrow }}\,\]
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