A) Ag
B) Ni
C) Pt
D) Zn
Correct Answer: A
Solution :
Cyanide process is used for extraction of silver (Ag). \[4Ag+8NaOH+{{H}_{2}}O+{{O}_{2}}4Na[Ag{{(CN)}_{2}}]\] \[+\,\,4NaOH\] \[2Na[Ag{{(CN)}_{2}}]+4NaOH+Zn\xrightarrow{{}}\] \[N{{a}_{2}}Zn{{O}_{2}}+2{{H}_{2}}O+4NaCN+2Ag\]
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