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Question

Magnetic moment of Cr+2(Z=24),Mn+2 (Z=25) and Fe2+(Z=26) are x,y,z They are in order :

A
x<y<z
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B
x>y>z
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C
z<x=y
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D
x=z<y
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Solution

The correct option is D x=z<y
24Cr2+[Ar]3d4 so n=4 ;
25Mn2+[Ar]3d5 so n =5 ;
26Fe2+[Ar]3d6 so n =4
n= Number of unpaired electron(s).
So the correct order of magnetic moment is =x=z<y

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