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Question
Chemistry
Which of the following oxides of manganese is amphoteric?
Q. Which of the following oxides of manganese is amphoteric?
1236
219
The d-and f-Block Elements
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A
M
n
O
2
B
M
n
2
O
3
C
M
n
2
O
7
D
M
n
O
Solution:
Acidic character of oxides increases with increase in oxidation number. So,
M
n
O
(
M
n
=
+
2
)
M
n
2
O
3
(
M
n
=
+
3
)
are basic,
M
n
O
2
(
M
n
=
+
4
)
is amphoteric and
M
n
2
O
7
(
M
n
=
+
7
)
is acidic.