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Chemistry Question on General Principles and Processes of Isolation of Elements

In the process of extraction of gold, Roasted gold ore +CN−+H2O→O2[X]+HO+CN^-+H_2O\xrightarrow{O_2}[X]+HO [X]+Zn→[Y]+Au[X]+Zn\rightarrow[Y]+Au Identify the complexes [X] and [Y]

A

X=[Au(CN)2]−,Y=[Zn(CN)4]2−X=[Au(CN)_2]^-,Y=[Zn(CN)_4]^{2-}

B

X=[Au(CN)4]3−,Y=[Zn(CN)4]2−X=[Au(CN)_4]^{3-},Y=[Zn(CN)_4]^{2-}

C

X=[Au(CN)2]−,Y=[Zn(CN)6]4−X=[Au(CN)_2]^-,Y=[Zn(CN)_6]^{4-}

D

X=[Au(CN)4]−,Y=[Zn(CN)4]2−X=[Au(CN)_4]^-,Y=[Zn(CN)_4]^{2-}

Answer

X=[Au(CN)2]−,Y=[Zn(CN)4]2−X=[Au(CN)_2]^-,Y=[Zn(CN)_4]^{2-}

Explanation

Solution

Au+2CN−→[Au(CN)2]−Au+2CN^-\rightarrow [Au(CN)_2]^-
2Au(CN)2−+Zn→[Zn(CN)4]2−+2Au2Au(CN)^-_2+Zn\rightarrow [Zn(CN)_4]^{2-}+2Au