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  4. Which of the following oxides of manganese is amphoteric?

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Q. Which of the following oxides of manganese is amphoteric?

The d-and f-Block Elements

Solution:

Acidic character of oxides increases with increase in oxidation number. So, $MnO(Mn = +2)$
$Mn_2O_3(Mn = +3)$ are basic, $MnO_2(Mn = +4)$ is amphoteric and $Mn_2O_7 (Mn = +7)$ is acidic.