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Among ni(CO)(4),[Ni(CN)(4)]^(2-) and NiC...

Among `ni(CO)_(4),[Ni(CN)_(4)]^(2-)` and `NiCI_(4)^(2-)` .

A

`ni(CO)_(4)` and `NiCI_(4)^(2-)` are diamagnetic and `[Ni(CN)_(4)]^(2-)` is paramagnetic .

B

`NiCI_(4)^(2-)` and `[Ni(CN)_(4)^(2-)` are diamagnetic and `Ni(CO)_(4)` is paramagnetic .

C

`NiCI_(4)^(2-)` and `[Ni(CN)_(4)^(2-)` are diamagnetic and `[Ni(CO)_(4)^(2-)` is paramagnetic .

D

`Ni(CO)_(4)` is diamagnetic and `NiCI_(4)^(2-)` and `[Ni(CN)_(4)]^(2-)` are paramagnetic .

Text Solution

Verified by Experts

The correct Answer is:
c

`[Ni(CO)_(4)] OS Ni is 0`
`Ni = (Z =28) implies 3d^(8) 4s^(2)`
`CO` is a strong field ligand it causes pairing
`sp^(3)` Hybridisation(tetrahedral) There are no unpaired electrons, so the complex is diamagnetic Spin magnetic moment = zero
(ii) `[Ni(CN)_(4)]^(2-),Ni^(2+) =3d^(8)`
Cyano is strong field ligand, it causes pairing
`dsp^(2)` hybridisation (squareplanar) There are no unpaired electrons so the complex diamgnetic Spin magnetic moment = zero
(iii) `[NiCI_(4)]^(2-),Ni^(2+) = 3d^(8)`
Chlorido is a weak field no pairing `sp^(3)` hybridisation (tetrahedral) There are two unpaired electrons, so the complex is paramagnetic Spin magnetic moment
`mu =sqrt( n (n +2)) BM = sqrt(2(2 + 2)) BM =sqrt8 BM`


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Amongst Ni(CO)_(4),[Ni(CN)_(4)]^(2-) and [NiCl_(4)]^(2-)

Give reason for the fact that amongst Ni(CO)_(4)[Ni(CN)_(4)]^(2-) and NiCI_(4)^(2-), Ni(CO)_(4) and [Ni(CN)_(4)]^(2-) are diamagnetic whereas [NiCI_(4)]^(2) is paramagnetic are diamagnetic whereas [NiCI_(4)]^(2) is paramagnetic .

Knowledge Check

  • Amongst Ni(CO)_(4),[Ni(CN)_(4)]^(2-) and NiCl_(4)^(2-) :

    A
    `Ni(CO)_(4) and NiCl_(4)^(2-)` are diamagnetic and `[Ni(CN)_(4)]^(2-)` is paramagnetic .
    B
    `NiCl_(4)^(2-) and [Ni(CN)_(4)]^(2-)` are diamagnetic and `Ni(CO)_(4)` is paramagnetic
    C
    `Ni(CO)_(4) and [Ni(CN)_(4)]^(2-)` are diamagnetic and `NiCl_(4)^(2-)` is paramagnetic
    D
    `Ni(CO)_(4)` is diamagnetic and `NiCl_(4)^(2-) and [Ni(CN)_(4)]^(2-)` are paramagnetic.
  • Amongst Ni(CO)_(4), [Ni(CN)_(4)]^(2-) and [NiCl_(4)]^(2-)

    A
    `Ni(CO)_(4) and [Ni(CN)_(4)]^(2-)` are diamagnetic and `[Ni(CN)_(4)]^(2-)` is paramagnetic
    B
    `[NiCl_(4)]^(2-) and [Ni(CN)_(4)]^(2-)` are diamagnetic and `Ni(CO)_(4)` is paramagnetic
    C
    `Ni(CO)_(4) and [Ni(CN)_(4)]^(2-)` are diamagnetic and `[NiCl_(4)]^(2-)` is paramagnetic
    D
    `Ni(CO)_(4)` is diamagnetic and `[NiCl_(4)]^(2-)` and `[Ni(CN)_(4)]^(2-)` are paramagnetic
  • Among [Ni(CO)_(4)],[Ni(CN)_(4)]^(2-) and [NiBr_(4)]^(2-) species, the hybridisation state of Ni atoms are respectively .

    A
    `sp^(3),ds^(2)p,dsp^(2)`
    B
    `sp^(3),dsp^(2),sp^(3)`
    C
    `dsp^(2),sp^(3),sp^(3)`
    D
    `sp^(3),sp^(3),dsp^(2)`
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