Which of the following has highest value of magnetic moment?
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Magnetic moment $=\sqrt{\text{n(n+2)}}$
$n=$ no. of unpaired electrons, $Fe^{+2}$ has $4$ unpaired electrons.
Other compound have less unpaired electrons.
More the number of electron, more the magnetic moment.
Thus $Fe^{2+}$ has the highest value of the magnetic moment among the given elements.
$n=$ no. of unpaired electrons, $Fe^{+2}$ has $4$ unpaired electrons.
Other compound have less unpaired electrons.
More the number of electron, more the magnetic moment.
Thus $Fe^{2+}$ has the highest value of the magnetic moment among the given elements.
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