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Tardigrade
Question
Chemistry
If KMnO4 is reduced by oxalic acid in an acidic medium, then oxidation number of Mn changes from
Q. If
K
M
n
O
4
is reduced by oxalic acid in an acidic medium, then oxidation number of
M
n
changes from
2138
210
Uttarkhand PMT
Uttarkhand PMT 2007
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A
4 to 2
B
6 to 4
C
+7 to +2
D
7 to 4
Solution:
2
K
M
n
O
4
+
7
+
3
H
2
S
O
4
→
K
2
S
O
4
+
2
M
n
S
O
4
+
2
+
3
H
2
O
+
5
[
O
]
5
H
2
C
2
O
4
+
5
[
O
]
→
10
C
O
2
+
5
H
2
O
Here,
M
n
+
7
in
K
M
n
O
4
has been reduced to
M
n
2
+
in
M
n
S
O
4
.