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Question

ln the process of extraction of gold,

Roasted gold ore + CN+H2OO2[X]+OH

[X]+ Zn [Y]+ Au

Identify the complexes [X] and [Y].

A
X=[Au(CN)2], Y=[Zn(CN)4]2
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B
X=[Au(CN)4]3, Y=[Zn(CN)4]2
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C
X=[Au(CN)2], Y=Zn(CN)6]4
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D
X=[Au(CN)4], Y=[Zn(CN)4]2
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Solution

The correct option is A X=[Au(CN)2], Y=[Zn(CN)4]2
Au (Roasted gold ore) + CN+H2OO2[X]+OH
Maximum Co-ordination Number= 2 × Oxidation Number of the metal.
Therefore,Au+ cannot have more than 2 cyanide ions attached.
The complex X=[Au(CN)2]

[Au(CN)2]+ Zn → [Y] + Au
According to the photochemical series, Zn can displace Au.Zn2+ cannot have Co-ordination Number more than 4, and it is the only form in which Zn exists.
Hence, the complex Y=[Zn(CN)4]2

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