Q.

Which of the following oxides of manganese is amphoteric?

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a

MnO2

b

Mn2O3

c

Mn2O7

d

MnO

answer is A.

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Detailed Solution

Acidic character of oxides increases when O.S. increases. Thus MnO and Mn2O3, are basic. MnO2 is amphoteric and Mn2O7 is acidic.
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