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Byju's Answer
Standard XII
Chemistry
Electrolytes
For the EMF o...
Question
For the EMF of a hydrogen electrode to be zero, the pressure of hydrogen required in neutral
p
H
is:
A
1
×
10
−
7
a
t
m
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B
1
×
10
−
14
a
t
m
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C
1.0
a
t
m
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D
0.0
a
t
m
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Solution
The correct option is
B
1
×
10
−
14
a
t
m
2
H
+
+
2
e
−
⟶
H
2
(
g
)
According to Nernst equation-
E
=
E
0
−
0.0591
2
log
p
H
2
[
H
+
]
2
For
E
=
0
;
E
0
=
0
∴
0
=
0
−
0.0591
2
log
p
H
2
(
10
−
7
)
2
(
∵
[
H
+
]
=
10
−
7
)
⇒
log
p
H
2
10
−
14
=
0
⇒
log
p
H
2
10
−
14
=
log
1
(
∵
log
1
=
0
)
⇒
p
H
2
10
−
14
=
1
⇒
p
H
2
=
10
−
14
atm
Hence for the EMF of a hydrogen electrode to be zero, the pressure of hydrogen required in neutral pH is
1
×
10
−
14
atm
.
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