# How can some manganese oxides be acidic and some basic?

For the manganese you have MnO and its idroxide $M n {\left(O H\right)}_{2}$ , $M {n}_{2} {O}_{3}$ and its idroxide $M n {\left(O H\right)}_{3}$ that have basic features. $M n {O}_{3} \mathmr{and} M {n}_{2} {O}_{3}$ that are acid oxides and give the acids ${H}_{2} M n {O}_{4} \mathmr{and} H M n {O}_{4}$ that are quite strong acids.
$M n {O}_{2}$ is an oxide with weak acid property and its solubility is very little.