A) barium
B) silver
C) boron
D) zinc
Correct Answer: B
Solution :
Cyanide process or Mac. Arthur-Forest cyanide process \[2A{{g}_{2}}S+8NaCN+{{O}_{2}}+2{{H}_{2}}O\xrightarrow{{}}\] \[4Na[Ag{{(CN)}_{2}}]+4NaOH+2S\] Soluble silver complex is filtered and treated with zinc dust and silver gets precipitated. \[2Na[Ag{{(CN)}_{2}}]+Zn\xrightarrow{{}}N{{a}_{2}}[Zn{{(CN)}_{4}}]\] \[+2Ag\downarrow \]
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