A) \[Au(CN)_{2}^{-}\]and \[Zn(CN)_{4}^{2-}\]
B) \[Au(CN)_{4}^{3-}\]and\[Zn(CN)_{4}^{2-}\]
C) \[Au(CN)_{3}^{-}\]and \[Zn(CN)_{6}^{4-}\]
D) \[Au(CN)_{4}^{-}\] and \[Zn(CN)_{3}^{-}\]
Correct Answer: A
Solution :
Extraction of gold (Au) involves the following sequence of reaction, Gold ore\[\xrightarrow[C{{N}^{-}},{{H}_{2}}O,{{O}_{2}}]{Roasting}H{{O}^{-}}+\underset{X}{\mathop{Au(CN)_{2}^{-}}}\,\] \[\xrightarrow{Zn}\underset{Y}{\mathop{Zn(CN)_{4}^{2-}}}\,+Au\] Hence, \[X=Au(CN)_{2}^{-},Y=Zn(CN)_{4}^{2-}\]You need to login to perform this action.
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