| \[{{\operatorname{CN}}^{-}}+{{H}_{2}}O\,\,\xrightarrow{{{O}_{2}}} [X]\,\,+\,\,O{{H}^{-}}\] |
| \[[X]\,\,+\,\,Zn\,\,\to \,\,[Y]\,\,+\,\,Au\] |
| Identify the complexes [X] and [Y] |
A) \[\operatorname{X}={{\left[ Au{{\left( CN \right)}_{2}} \right]}^{-}},\,\,Y={{\left[ Zn{{\left( CN \right)}_{4}} \right]}^{2-}}\]
B) \[\operatorname{X}={{\left[ Au{{\left( CN \right)}_{4}} \right]}^{3-}},\,\,Y={{\left[ Zn{{\left( CN \right)}_{4}} \right]}^{2-}}\]
C) \[\operatorname{X}={{\left[ Au{{\left( CN \right)}_{2}} \right]}^{-}},\,\,Y={{\left[ Zn{{\left( CN \right)}_{6}} \right]}^{4-}}\]
D) \[\operatorname{X}={{\left[ Au{{\left( CN \right)}_{4}} \right]}^{-}},\,\,Y={{\left[ Zn{{\left( CN \right)}_{4}} \right]}^{2-}}\]
Correct Answer: A
Solution :
Roasted gold ore \[+C{{N}^{-}}\,+\,\,{{H}_{2}}O \xrightarrow{{{O}_{2}}}\,\,{{\left[ Au{{(CN)}_{2}} \right]}^{-}}\,\,+\,\,O{{H}^{-}}\] \[{{\left[ Au{{\left( CN \right)}_{2}} \right]}^{-}}\, +\,\,Zn\,\,\to \,\,{{\left[ Zn{{\left( CN \right)}_{4}} \right]}^{2-}}\]
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