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Magnetic moment of Cr(Z=24), Mn^+(Z=25) ...

Magnetic moment of `Cr(Z=24), Mn^+(Z=25)` and`Fe^(2+)(Z=26)` are x,y,z. They are in order

A

Increases with increasing number of unpaired electrons

B

gives indication about the number of unpaired electrons present in the atom, molecule or ion

C

its unit is Bohr magneton (BM).A single unpaired electron has 1.73 BM magnetic moment

D

All of the above are true

Text Solution

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The correct Answer is:
D
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Use the EAN rule to predict the molecular formula for the simple carbonyls of (a) Cr(Z = 24) (b) Fe (Z =26) and (c ) Ni (Z =28) (Assume that the oxidation state of the metals in the these carbonyls is zero) .

The E^(@) values in respect of the electrodes of chromium (Z= =24), manganese ( Z = 25) and iron ( Z= 26 ) are : Cr^(3+) // Cr^(2+) = - 0.4 V, Mn^(3+)//Mn^(2+) = + 1.5 V, Fe^(3+) //Fe^(2+) = + 0.8 V . On the basis of the above information compare the feasiblities of further oxidation of their +2 oxidation states.

Knowledge Check

  • Magnetic moment of Cr^(+2)(Z=24),Mn^(+2)(Z=25) and Fe^(2+)(Z=26) are x,y,z. they are in order:

    A
    xltyltz
    B
    xgtygtz
    C
    zltx=y
    D
    x=zlty

  • Magnetic moment of Cr^(+2)(Z=24),Mn^(+2)(Z=25) and Fe^(2+) (Z=26) are x,y,z. they are in order

    A
    `xltyltz`
    B
    `xgtygtz`
    C
    `zltx=y`
    D
    `x=zlty`

  • Magnetic moment of Cr^(+2)(Z=24) , Mn^(+2)(Z=25) and Fe^(3+)(Z=26) are x,y,z . They are in order

    A
    `x lt y lt z`
    B
    ` x gt y gt z`
    C
    `z gt x =y`
    D
    `x=z lt y`

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    Magnetic moment of Cr^(+2)(Z=24) , Mn^(+2)(Z=25) and Fe^(3+)(Z=26) are x,y,z . They are in order

    Transition metals and many of their compounds show paramagnetic behaviour where there are unpaired electron or electrons. The magnetic moment arises from the spin and orbital motions in ions or molecule. Magnetic moment of n unpaired electrons is given as mu=sqrt(n(n+2)) Bohr magneton Magnetic moment increases as the number of unpaired electrons increases. Q. Magnetic moments of Cr(Z=24),Mn^(o+)(Z=35) and Fe^(2+)(Z=36) are x,y and z respectively. Which of the following order is correct?

    Magnetic moments of V(Z = 23), Cr(Z = 24), Mn (Z = 25) are x,y,z. HencE:

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