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Incerasing order of EAN of the metals in [Ni(CN)_(4)]^(2-),[Fe(CN)_(6)]^(3-)and[Cu(CN)_(4)]^(3-) is

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`[NI(CN)_(4)]^(2-)lt[FE(CN)_(6)]^(3-)lt[Cu(CN)_(4)]^(3-)`
`[Ni(CN)_(4)]^(2-)lt[Fe(CN)_(6)]^(3-)=[Cu(CN)_(4)]^(3-)`
`[Ni(CN)_(4)]^(2-)lt[Cu(CN)_(4)]^(3-)lt[Fe(CN)_(6)]^(3-)`
`[Cu(CN)_(4)]^(2-)lt[Fe(CN)_(6)]^(3-)lt[Ni(CN)_(4)]^(2-)`

Solution :`[Ni(CN)_(4)]^(2-)to28-2+4xx2=26+8=34`
`[Fe(CN)_(6)]^(3-)to26-3+6xx2=23+12=35`
`[Cu(CN)_(4)]^(3-)to29-1+4xx2=28+8=36`


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