Roasted gold ore +CN−+H2O⟶O2[X]+OH−;[X]+Zn⟶[Y]+Au. [X] and [Y] are

2Au+4CN−+H2O+12O2⟶2Au(CN)2−+2OH−2Au(CN)2−+Zn⟶Zn(CN)42−+2Au

Roasted gold ore +CN−+H2O⟶O2[X]+OH−;[X]+Zn⟶[Y]+Au. [X] and [Y] are

2Au+4CN−+H2O+12O2⟶2Au(CN)2−+2OH−2Au(CN)2−+Zn⟶Zn(CN)42−+2Au

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Roasted gold ore $+ {CN}^{-} + H_{2} O \overset{O_{2}}{⟶} [X] + {OH}^{-}; [X] + Zn ⟶ [Y] + Au . [X] and [Y]$ are

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$X = {[Au (CN)_{2}]}^{-}; Y = {[Zn (CN)_{4}]}^{2 -}$

$X = {[Au (CN)_{4}]}^{3 -}; Y = {[Zn (CN)_{4}]}^{2 -}$

$X = {[Au (CN)_{2}]}^{-}; Y = {[Zn (CN)_{6}]}^{4 -}$

$X = {[A u (C N)_{4}]}^{3 -}; Y = {[Z n (C N)_{6}]}^{2 -}$

answer is A.

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$2 Au + 4 {CN}^{-} + H_{2} O + \frac{1}{2} O_{2} ⟶ 2 Au (CN)_{2}^{-} + 2 {OH}^{-}$

$2 {[Au (CN)_{2}]}^{-} + Zn ⟶ {[Zn (CN)_{4}]}^{2 -} + 2 Au$

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Roasted gold ore +CN−+H2O⟶O2[X]+OH−;[X]+Zn⟶[Y]+Au. [X] and [Y] are

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Roasted gold ore $+ {CN}^{-} + H_{2} O \overset{O_{2}}{⟶} [X] + {OH}^{-}; [X] + Zn ⟶ [Y] + Au . [X] and [Y]$ are