A) \[NaCl\]
B) \[N{{a}_{2}}C{{O}_{3}}\]
C) \[\text{NaCN}\]
D) \[N{{a}_{2}}S{{O}_{4}}\]
Correct Answer: C
Solution :
NaCN is used in the extraction of silver because concentrated ore \[(A{{g}_{2}}S)\] is leached with 0.4% solution of NaCN kept agitated by a-ciirrent of air. Silver passed into the solution due to the formation of a complex cyanide sodium argentocyanide. \[\underset{\begin{smallmatrix} \text{Silver}\,\text{glance} \\ \,\,\,\,\,\,\,\,\text{(ore)} \end{smallmatrix}}{\mathop{A{{g}_{2}}S~+}}\,\text{ }4NaCN\text{ }\xrightarrow{{}}\text{ }\underset{\begin{smallmatrix} \text{Sodium}\,\text{argentocyandie} \\ \text{(soluuble}\,\text{complex)} \end{smallmatrix}}{\mathop{2Na\text{ }\left[ Ag{{(CN)}_{2}} \right]}}\,\] \[\text{+N}{{\text{a}}_{\text{2}}}\text{S}\]
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