Why is E0 value for Mn3+/Mn2+ couple much more positive than that for Cr3+/Cr2+ or Fe3+/Fe2+. Explain.
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The reason to this is:
#half filled configuration of Mn+2:
Mn2+ exists in 3d5 configuration which is half filled configuration and such half filled configurations provide extra stability to the Metal Ion. While Mn3+ will exist in 3d4 configuration which is less stable than 3d5.
Hence the conversion from 3+ to 2+ OS is very feasible. Hence E° value is +very depicting that ∆G° being -ve. And we know when ∆G° becomes -ve the reaction is feasible.
#half filled t2g configuration of Cr+3:
Because of 3d3 half filled d orbital extra stability is attained by Cr+3 than Cr+2. hence Cr+3------->Cr+2 is less feasible. Hence reaction bing against the stability has less E° Value.
100% correct answer
#half filled configuration of Mn+2:
Mn2+ exists in 3d5 configuration which is half filled configuration and such half filled configurations provide extra stability to the Metal Ion. While Mn3+ will exist in 3d4 configuration which is less stable than 3d5.
Hence the conversion from 3+ to 2+ OS is very feasible. Hence E° value is +very depicting that ∆G° being -ve. And we know when ∆G° becomes -ve the reaction is feasible.
#half filled t2g configuration of Cr+3:
Because of 3d3 half filled d orbital extra stability is attained by Cr+3 than Cr+2. hence Cr+3------->Cr+2 is less feasible. Hence reaction bing against the stability has less E° Value.
100% correct answer
darshanshree2003:
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Thanks lot
crystal clear explanation
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