Why are `Mn^(2+)` compounds more stable than `Fe^(2+)` towards oxidation to their +3 state?

Why are Mn^(2+) compounds more stable than Fe^(2+) toward oxidation to their +3 state?

(a). Why Mn^(2+) compounds are more stable than Fe^(2+) towards oxidation to their +3 state? (b). Calculate the magnetic moment of V^(3+) ion. (c). [Ti(H_2O)_6_^(3+) gives violet coloured aqueous solution but [Mg(H_2O)_6]^(2+) solution is colourless. (d). [Ti(H_2O)_6]^(3+) is coloured whereas [Sc(H_2O)_6]^(3+) is colourless. Why?

Fe^(3+) compounds are more stable than Fe^(2+) compounds because

The stable oxidation states of Mn are

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