A) \[Na\]
B) \[Cu\]
C) \[Ag\]
D) \[Fe\]
Correct Answer: C
Solution :
Hydrometallurgy \[A{{g}_{2}}S+4NaCN\to 2Na[Ag{{(CN)}_{2}}]+N{{a}_{2}}S\] \[2Na[Ag{{(CN)}_{2}}]+Zn\to N{{a}_{2}}[Zn{{(CN)}_{4}}]+2Ag\]
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