Question

# The most basic oxide among MnO, $M{n_2}{O_3},{\text{ }}Mn{O_2}$and $M{n_2}{o_7}$ is :$A.\;\;\;\;\;MnO \\ B.\;\;\;\;\;Mn{O_2} \\ C.\;\;\;\;\;M{n_2}{O_3} \\ D.\;\;\;\;\;M{n_2}{O_7} \\$

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Hint:
For the transition metal oxides, the lowest oxidation state is the most basic, since it can donate lone pairs of electrons and function as a Lewis base.

Further, in case on $M{n_2}{O_7}$, Mn is +7 oxidation state so it is more acidic and hence least basic