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Byju's Answer
Standard XII
Chemistry
SHE
E^o for the ...
Question
E
o
for the half cell
Z
n
2 +
/Zn
is
−
0.76
V
. emf of the cell
Zn/Z
n
2 +
(
1M
)
//
H
+
(
1M
)
/
H
2
at 1 atm is
A
−
0.76
V
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B
+
0.76
V
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C
−
0.38
V
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D
+
0.38
V
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Solution
The correct option is
B
+
0.76
V
E
0
c
e
l
l
=
E
c
a
t
h
o
d
e
−
E
a
n
o
d
e
.
=
E
H
+
/
H
2
−
E
Z
n
2
+
Z
n
=
0
−
(
−
0.76
)
=
+
0.76
Suggest Corrections
0
Similar questions
Q.
E
0
Z
n
2
+
/
Z
n
=
−
0.76
V
The EMF of the cell
Z
n
/
Z
n
2
+
(
1
M
)
|
|
H
C
l
(
p
H
=
2
)
|
H
2
(
1
a
t
m
)
,
P
t
is :
:
Q.
The standard reduction potential
E
o
for half reactions are,
Z
n
→
Z
n
2
+
+
2
e
−
;
E
o
=
−
0.76
V
F
e
2
+
+
2
e
−
→
F
e
;
E
o
=
+
0.41
V
The emf of the cell reaction;
F
e
2
+
+
Z
n
→
Z
n
2
+
+
F
e
is:
Q.
The standard reduction potential
E
o
for the half reactions are as
Z
n
⟶
Z
n
2
+
+
2
e
−
;
E
o
=
+
0.76
V
F
e
⟶
F
e
2
+
+
2
e
−
;
E
o
=
+
0.41
V
The emf for cell reaction,
F
e
2
+
+
Z
n
⟶
Z
n
2
+
+
F
e
, is
Q.
The standard cell potential for the cell
Z
n
∣
∣
Z
n
2
+
(
1
M
)
∣
∣
∣
∣
C
u
2
+
(
1
M
)
∣
∣
C
u
gien
E
o
C
u
2
+
/
C
u
=
0.34
V
and
E
o
z
n
2
+
/
Z
n
=
−
0.76
V
is
Q.
The standard reduction potential
E
o
for half reaction are:
Z
n
→
Z
n
2
+
+
2
e
−
;
E
o
=
+
0.76
V
F
e
→
F
e
2
+
+
2
e
−
;
E
o
=
+
0.41
V
The EMF of the cell reaction is:
F
e
2
+
+
Z
n
→
Z
n
2
+
+
F
e
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