A) \[Ag\]
B) \[Cu\]
C) \[Al\]
D) \[Zn\]
Correct Answer: A
Solution :
Gold (Au) and silver (Ag) are extracted by treating their ores with dilute \[NaCN\] solution in the presence of air. During this process, a cyanide complex is formed which gives pure metal when treated with more electropositive metal like Zn. \[4\,Ag+8C{{N}^{-}}+2{{H}_{2}}O+{{O}_{2}}\] \[\xrightarrow{{}}4{{[Ag\,{{(CN)}_{2}}]}^{-}}+4O{{H}^{-}}\] \[2{{[Ag\,(C{{N}_{2}})]}^{-}}+Zn\xrightarrow{{}}{{[Zn{{(CN)}_{4}}]}^{2-}}+\underset{\text{Silver}}{\mathop{2\,Ag}}\,\] This process is called Mac Arthur Forest process.
You need to login to perform this action.
You will be redirected in
3 sec
