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How many cyanide ions are involved in th...

How many cyanide ions are involved in the following chemical equation ?
`Au + CN^(Ө)+ H_(2)O +O_(2) rarr [Au(CN)_(2)]^(Ө) + overset(Ө) O H`.

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The correct Answer is:
`(8)`
`4Au + 8CN^(Ө) + 2H_(2)O + O_(2) rarr 4[Au(CN)_(2)]^(Ө) + 4 overset (Ө) O H`.
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CENGAGE CHEMISTRY-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exercise (Integer)
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