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Standard X
Biology
Applications of Biotechnology
16. In a dry ...
Question
16. In a dry cell cathode, does MnO2 change to MnO(OH) or Mn2O3?
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Q.
Write anode and cathode reactions that occur in dry cell. How does a dry cell differ from a mercury cell?
Q.
In a zinc manganese dioxide dry cell, the anode is made up of zinc and cathode of a carbon rod surrounded by a mixture of
M
n
O
2
,
c
a
r
b
o
n
,
N
H
4
C
l
and
Z
n
C
l
2
in aqueous base.
The cathodic reaction may be represented as:
2
M
n
O
2
(
s
)
+
Z
n
2
+
+
2
e
−
→
Z
n
M
n
2
O
4
(
s
)
Let there be
8
g
M
n
O
2
in the cathodic compartment. How many days will the dry cell continue to give a current of
4
×
10
−
3
ampere?
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The
Z
n
C
l
used in a dry cell is which helps to maintain the moistness of paste contained in the cell between anode and cathode is
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Carbon rod in a dry cell acts as anode, which is insulated from the cathode by
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