1.

Which of the following complexes formed by Cu^(2+) ions most stable ?

Answer»

`Cu^(2)+4NH_(3)hArr[Cu(NH_(3))_(4)]^(2+), LOG K=11.6`
`Cu^(2)+4CN^(-)hArr[Cu(CN)_(4)]^(2-), log K=27.3`
`Cu^(2)+2enhArr[Cu(en)_(2)]^(2+), log K=15.4`
`Cu^(2)+4H_(2)OhArr[Cu(H_(2)O)_(4)]^(2+), log K=8.9`

Answer :B


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