A) Titanium
B) Vanadium
C) Silver
D) Zinc
Correct Answer: C
Solution :
Silver metal is obtained by Mac-Arthur forest process which is called cyanide process. The concentrated ore of argentite is treated with dilute \[\text{NaCN}\]solution and a current of \[{{\text{O}}_{2}}\] is continuously passed. Silver sulphide goes into solution in the form of soluble complex sodium argentocyanide. \[2A{{g}_{2}}S+8NaCN+{{O}_{2}}+2{{H}_{2}}O\xrightarrow{{}}\] \[4Na\,[Ag{{(CN)}_{2}}]+4NaOH+2S\]The soluble complex is treated with zinc dust, when silver gets precipitated. \[2Na[Ag{{(CN)}_{2}}]+\,Zn\to N{{a}_{2}}[Zn{{(CN)}_{4}}]+2Ag\downarrow \]
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