A) \[Ag\]
B) \[Ti\]
C) \[Zn\]
D) \[Sn\]
Correct Answer: A
Solution :
\[C{{N}^{-}}\] ion is used in the extraction of silver \[(Ag)\] metal. Since, silver is precipitated by complex formation. Powered argentite \[(A{{g}_{2}}S)\] is lixiviated with dil. \[NaCN\] solution in presence of air. \[A{{g}_{2}}S+4NaCN\xrightarrow{air}\underset{\begin{smallmatrix} Argentocyanide \\ (complex\,salt) \end{smallmatrix}}{\mathop{2Na[Ag{{(CN)}_{2}}]}}\,+N{{a}_{2}}S{{O}_{4}}\]To, this complex salt metallic zinc is added. \[2Na[Ag{{(CN)}_{2}}]+Zn\xrightarrow{{}}\underset{Black\,ppt.}{\mathop{\underset{+2Ag\downarrow }{\mathop{N{{a}_{2}}[Zn(C{{N}_{4}})(aq).]}}\,}}\,\]
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