Siya + 3 is reducing and mn + 3 is oxidising agent when both have d4 configuration
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Cr2+ after loosing an electron converted into Cr3+,d3 is just half filled t2g,more stable.
Mn3+ after gaining an electron converted into Mn2+,which has d5 just half filled d orbitals.
Mn has 2 electrons in 4s orbital thus after loosing 2 e-,it will get d5 easily as e- will added in same d orbital
Cr has configuration..4s1,3d5 ,exceptional case to get stability 1 e- from s jumps to 3d,Now after the removal of e- from d orbital,reorganisation of energy takes place.thus it is difficult to add 1 e- in d orbital.
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