Question

Arrange the oxides of manganese according to increasing acidic strength.
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 1

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