A) Fused mixture of \[A{{g}_{2}}S\] and \[KCl\] is electrolysed
B) \[A{{g}_{2}}S\] is reduced with \[CO\]
C) \[A{{g}_{2}}S\]is roasted to \[A{{g}_{2}}O\]which is reduced with carbon
D) Treating argentite with \[NaCN\] solution followed by metal displacement with zinc
Correct Answer: D
Solution :
\[A{{g}_{2}}S+4NaCN\to 2Na[Ag{{(CN)}_{2}}]+N{{a}_{2}}S\] \[2Na[Ag{{(CN)}_{2}}]+Zn\to N{{a}_{2}}[Zn{{(CN)}_{4}}]+2Ag\]
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