How many cyanide ions are involved in th...

How many cyanide ions are involved in the following chemical equation?
`Au + CN^ѳ + H_2 O +O_2 rarr [Au(CN)_2]^(ѳ) + overset(ѳ)(OH)`

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The correct Answer is:

8

`4Au + 8CN^(-) + 2H_2O + O_2 rarr 4[Au(CN)_2]^(-) + 4OH^-`

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