EAMCET Engineering 2006 Solved Paper

Spin only magnetic moments depend upon the number of unpaired electrons, more the number of unpaired electron, greater will be the spin only magnetic moment.
‌‌25‌Mn=1s2,2s22p6,3s23p63d5,4s2
‌Mn2+=1s2,2s22p63s23p63d5,4s0
Number of unpaired electrons =5
‌24‌Cr=1s2,2s22p6,3s23p63d5,4s1
Cr2+=1s2,2s22p6,3s23p63d4,4s0
Number of unpaired electrons =4
‌23V‌=1s2,2s22p6,3s23p63d3,4s2
V2+‌=1s2,2s22p6,3s23p63d3,4s0
Number of unpaired electrons =3
So, the correct order of spin only magnetic moment is
Mn2+>Cr2+>V2+