Multiple choice Correct order of acidic character of oxides of manganese is MnO < MnO2 < Mn2O3 < Mn2O7 Mn2O7 < Mn2O3 < MnO2 < MnO MnO < Mn2O3 < MnO2 < Mn2O7 MnO < Mn2O3 < Mn2O7 < MnO2 Mn2O3 < MnO2 < MnO < Mn2O7 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Correct order of acidic behaviour is Mangnese(II) oxide < Manganese(III) oxide < Manganese(IV) oxide < Manganese(VII) oxide.