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Tardigrade
Question
Chemistry
Which of the following statement is incorrect for dry cell?
Q. Which of the following statement is incorrect for dry cell?
363
160
Electrochemistry
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A
Reaction at cathode
M
n
O
2
+
N
H
4
+
+
e
−
⟶
M
n
O
(
O
H
)
+
N
H
3
11%
B
Manganese is reduced from
+
5
to
+
4
state
67%
C
Cell potential is
1.5
V
11%
D
Ammonia form complex with
Z
n
2
+
to give
[
Z
n
(
N
H
3
)
4
]
2
+
12%
Solution:
Anode
Z
n
(
s
)
⟶
Z
n
2
+
(
a
q
)
+
2
e
−
Cathode
M
n
O
2
+
N
H
4
+
+
e
−
⟶
M
n
O
(
O
H
)
+
N
H
3
At cathode manganese is reduced from
+
4
oxidation state to
+
3
oxidation state.
Ammonia produced in reaction form complex with
Z
n
2
+
to give
[
Z
n
(
N
H
3
)
4
]
2
+
.
The cell has potential of
1.5
V
.