Arrange the oxides of manganese according to increasing acidic strength.

Options

A. `MnO lt Mn_3O_4 lt Mn_2O_3 lt MnO_2 lt Mn_2O_7`
B. `Mn_2O_7 lt MnO_2 lt Mn_2O_3 lt Mn_3O_4 lt MnO`
C. `MnO_2 lt Mn_2O_7 lt Mn_3O_4 lt Mn_2O_3 lt MnO`
D. `Mn_3O_4 lt Mn_2O_3 lt Mn_2O_7 lt MnO_2 lt MnO`

Answer

A

Explanation

Acidic strength of oxides of transition metals increases with increases in oxidation number.
`overset(+2)(MnO),overset(+8//3)(Mn_3O_4),overset(+3)(Mn_2O_3),overset(+4)(MnO_2),overset(+7)(Mn_2O_7)`
Hence acidic strength is of the order of
`underset("Basic")(MnO)lt Mn_2O_4 lt underset("Amphoteric")(Mn_2O_3) lt MnO_2 lt underset("Acidic")(Mn_2O_7)`