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Question
Chemistry
In the electrolysis of aqueous sodium chloride solution which of the half cell reaction will occur at anode?
Q. In the electrolysis of aqueous sodium chloride solution which of the half cell reaction will occur at anode?
4091
214
KCET
KCET 2017
Electrochemistry
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A
N
a
+
(
a
q
)
+
e
−
→
N
a
(
s
)
E
cell
∘
=
2.71
V
19%
B
2
H
2
O
(
l
)
⟶
O
2
+
4
H
+
+
4
e
−
E
ce
11
∘
=
+
1.23
V
20%
C
2
H
+
(
a
q
)
+
e
−
⟶
2
1
H
2
E
ce
ll
∘
=
0.00
V
14%
D
C
l
−
(
a
q
)
⟶
2
1
C
l
2
+
e
−
E
ce
ll
∘
=
1.36
V
47%
Solution:
In the electrolysis of aqueous sodium chloride solution, chlorine gas is liberated at the anode.
<
b
r
/
>
C
l
(
a
q
)
−
+
e
−
→
2
1
C
l
2
+
e
−
E
cell
0
=
1.36
V
This is because
C
l
−
ions have lower discharge potential than
O
H
−
ions.