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