Why does Mn(II) shows maximum paramagnetic
character among the divalent ions of first transition series ?

Explanation

The divalent metal ion with maximum number of unpaired electrons will have maximum Paramagnetic character. The divalent metal ion with maximum number of unpaired electrons is `Mn^(2+)` as explained below:
`Mn (Z=25): 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5`
`Mn^(2+) : 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5`
Therefore `Mn^(2+)` has five unpaired electrons and has maximum Paramagnetic character.