Which oxidation state of Mn is most stable and why?
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Mn+4 has the configuration 3d3 4s0.Now,in the crystal field splitting diagram, you can see that this configuration leads to a half filled t2g level which is highly stable due to gain in both CFSE (the value is -12∆°) and also exchange energy.This makes +4 state so stable.
In +2 state the configuration is 3d5.So although the CFSE value here is 0,still there is a high amount of exchange energy associated with the half filled 3d orbital which contributes to the stability of this state.
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mn ..having a lot number of of oxidation .state like .++6 +3+5+7+2+4 actually .most stable +2
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