1.

Mn^(2+) compounds are more stable than Fe^(2+) compounds towards oxidation to their +3 state, because

Answer»

`Mn^(2+)` is more stable with high 3rd ionisation energy
`Mn^(2+)` is BIGGER in size
`Mn^(2+)` has completely filled d- orbitals
`Mn^(2+)` does not exist

SOLUTION : `Mn^(2+)` has stable HALF - filled electronic configuration thus it has high third ionisation energy while `Fe^(2)` on losing one more electron will acquire this stable electronic configuration.
Thus `Fe^(2+)` is more prone to get oxidised to +3 oxidation state .


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