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Which of the following complexes formed ...

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

A

`Cu^(2+)+4NH_(3) rarr [Cu(NH_(3))_(4)]^(2+), log K=11.6`

B

`Cu^(2+)+4CN^(-) rarr [Cu(CN)_(4)]^(2-), log K=27.3`

C

`Cu^(2+)+2en^(-) rarr [Cu(en)_(2)]^(2+), log K=15.4`

D

`Cu^(2+)+4H_(2)O rarr [Cu(H_(2)O)_(4)]^(2+), log K =8.9`

Text Solution

Verified by Experts

The correct Answer is:
B
Greater the value of log K, greater will be stability of complex compound formed. For reaction,
`Cu^(2+) + 4CN^(-) rarr [Cu(CN)_(4)]^(2-)`
`K=([(Cu(CN)_(4))^(2-)])/([Cu^(2+)][CN^(-)]^(4))` and `log K=27.3`
For this reaction, log K has highest value among the given four reactions. Hence, K will also be higher among these four. i.e., stability of the complexes will be highest among these four complexes.
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Knowledge Check

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

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

  • Which of the following compounds formed by Cu2^(+) ions is most stable?

    A
    `Cu^(2+)+4NH_(3) to [Cu(NH_(3))_(4))}^(2),Log K = 11.6`
    B
    `Cu^(2+)+4CN^(-)rarr[Cu(CN)_4]^(2-),Log K =27.3`
    C
    `Cu^(2+)+2enrarr[Cu(en)_(2)]^(2+),Log K =15.4 `
    D
    `Cu^(2+) + 4H_(2)) to [ Cu(H_(2)O)_(4)]^(2+) : Log K = 8.9`

  • Which of the following complex is most stable ?

    A
    `[M(NH_(3))_(6)]^(2+)`
    B
    `[M(NH_(3))_(6)]^(3+)`
    C
    `[M(en)_(2)(NH_(3))_(2)]^(3+)`
    D
    `[M(en)_(3)]^(3+)`

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