A) Displacement with Zn
B) Liquation
C) Distillation
D) Zone refining
Correct Answer: A
Solution :
Zn being more reactive than Ag and Au, displaces them. From Native ore, \[4Ag+8NaCN+2{{H}_{2}}O+{{O}_{2}}\xrightarrow{\text{Leaching}}\] \[\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{Souble} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{Sodium}\, \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{dicyanoargen}\,\text{late}\,\text{(I)} \end{smallmatrix}}{\mathop{4Na[Ag{{(CN)}_{2}}]}}\,+4NaOH\] \[2Na[Ag{{(CN)}_{2}}]+Zn\xrightarrow{\text{Displaceement}}\] \[N{{a}_{2}}[Zn{{(CN)}_{4}}]+2Ag\downarrow \]
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