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Valence bond theory successfully explain...

Valence bond theory successfully explains the magnetic behaviour of complexes. The substances which contains unpaired electrons are paramagnetic and paramagnetic character increases as the number of unpaired electrons increases. Magnetic moment of a complex can be determined experimentally and by using formula `sqrt(n(n+2))` and we can determine the number of unpaired electrons in it. This information is important in writing electronic structure of complex which in turn also useful in deciding the geometry of complex.
There are four complexes of Ni. Select the complex/es which will be attracted by magnetic field.
`underset((I))([Ni(CN)_(4)]^(2-))" "underset((II))([NiCl_(4)]^(2-))" "underset((II))(Ni(CO)_(4))" "underset((IV))([Ni(H_(2)O)_(6)]^(2+))`

A

I only

B

II and IV only

C

II, III and IV

D

II and IV

Text Solution

Verified by Experts

The correct Answer is:
D
`Cl^(-)` and `H_(2)O` are week field ligands and hence no regrouping of electrons.
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Knowledge Check

  • Valence bond theory successfully explains the magnetic behaviour of complexes. The substances which contains unpaired electrons are paramagnetic and paramagnetic character increases as the number of unpaired electrons increases. Magnetic moment of a complex can be determined experimentally and by using formula sqrt(n(n+2)) and we can determine the number of unpaired electrons in it. This information is important in writing electronic structure of complex which in turn also useful in deciding the geometry of complex. Which of the following are diamagnetic ? 1) K_(4)[Fe(CN)_(6)] 2) K_(3)[Cr(CN)_(6)] 3) K_(3)[Co(CN)_(6)] 4) K_(2)[Ni(CN)_(4)]

    A
    1, 2,& 4
    B
    1, 3 & 4
    C
    2 & 3
    D
    1 & 4

  • Valence bond theory successfully explains the magnetic behaviour of complexes. The substances which contains unpaired electrons are paramagnetic and paramagnetic character increases as the number of unpaired electrons increases. Magnetic moment of a complex can be determined experimentally and by using formula sqrt(n(n+2)) and we can determine the number of unpaired electrons in it. This information is important in writing electronic structure of complex which in turn also useful in deciding the geometry of complex. The magnetic moment of complexes given below are in the order : {:(Ni(CO)_(4),[Mn(CN)_(6)]),("(I)","(II)"),([Cr(NH_(3))_(6)]^(3+),[CoF_(6)]^(3+)),("(I)","(II)"):}

    A
    `IgtIIgtIIIgtIV`
    B
    `IltIIltIIIltIV`
    C
    `IVgtIIgtIgtIII`
    D
    `IVltIIltIltIII`

  • The species which contains unpaired electrons is

    A
    Oxide ion
    B
    Peroxide ion
    C
    Superoxide
    D
    Suborix ion

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