A) Au
B) Ag
C) Cu
D) Zn
Correct Answer: B
Solution :
Mac Arthur process is used for the extraction of silver (Ag). \[A{{g}_{2}}S+4NaCN\rightleftharpoons \underset{Sod.\,\arg entocyanide}{\mathop{2Na[Ag{{(CN)}_{2}}]+N{{a}_{2}}S}}\,\] \[2Na[Ag{{(CN)}_{2}}]\underset{Sod.\,zincoyanide\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(ppt.)\,}{\mathop{+Zn\to N{{a}_{2}}[Zn{{(CN)}_{4}})]+2Ag\downarrow }}\,\] It is also used for extraction of gold.
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