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Tardigrade
Question
Chemistry
Which of the following oxides of Cr is amphoteric?
Q. Which of the following oxides of
C
r
is amphoteric?
1927
202
The d-and f-Block Elements
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A
C
r
O
2
19%
B
C
r
2
O
3
59%
C
C
r
O
5
13%
D
C
r
O
3
9%
Solution:
Acidic character of metal oxides increases with increase in oxidation number. Thus,
C
r
2
O
3
(
C
r
=
+
3
)
is basic,
C
r
O
2
(
C
r
=
+
4
)
is amphoteric,
C
r
O
3
(
C
r
=
+
6
)
is acidic.
C
r
O
5
is peroxide which is also acidic.