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The correct order of the magnetic moment is:

 25Mn,24Cr,26Fe

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a
Fe3+>Cr3+=Mn4+
b
Fe3+>Cr3+>Mn4+
c
Cr3+=Mn4+>Fe3+
d
Fe3+>Mn4+>Cr3+

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detailed solution

Correct option is A

The magnetic moment of 

15

In Fe+3, there are 23 electrons in total.

In light of this, its electronic configuration is-

1s22s22p63s23p63d5

The magnetic moment is therefore 5(5+1) and it has 5 unpaired electrons.

=30=5.47

In Cr+3, there are 21 electrons in total.

In light of this, its electronic configuration is-

1s22s22p63s23p63d3

The magnetic moment is therefore 3(3+1) and it has three unpaired electrons.

=12=3.46

Thus, the order of magnetic moment is 

Fe+3>Cr+3=Mn+4.

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