Why are the compounds of bismuth more stable in +3 oxidation state ?

Which is the more stable oxidation state of Pb ?

Why are Mn compound more stable than Fe towards oxidation to their + 3 state?

The stable oxidation state of Bismuth is

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

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

Manganese in the +2 oxidation state is more stable than +3 oxidation state where as iron is stable at +3 oxidation state than +2 oxidation state. Explain why

Why are Mn '2+)' compounds more stąble than Fe towards oxidation to their +3 state?