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InterviewSolution
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The extraction of ----- by the formation of cyanide complex is a typical example of the use of coordination compounds in metallurgical processes.A. AgB. AuC. CuD. Both 1 and 2 |
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Answer» Correct Answer - D Some important extraction processe of metals, like those of Ag and Au, make use of complex formation. Gold, for example, combines with cyanide in the presence of oxygen and water to form the coordination entity `[Au(Cu)_(2)]^(-)` in aqueous solution. Gold can be separated in metallic form this solution by the addition of zinc. `4Au(s)+8CN^(-)(aq)+O_(2)(g)+2H_(2)O(1) rarr 4[Au(CN)_(2)]^(-)(aq)+ 4OH^(-)(aq)` `Zn(s)+2[Au(CN)_(2)]^(-) (aq) rarr [Zn(CN)_(4)]^(2-)+2Au(s)` |
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