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Byju's Answer
Standard XII
Chemistry
Gibb's Energy and Nernst Equation
If for the fo...
Question
If for the following half-cell reactions :
C
u
2
+
+
e
−
→
C
u
⊕
;
E
⊕
=
1.77
V
C
u
2
+
+
2
e
−
→
C
u
;
E
⊖
=
−
0.34
The
E
⊖
of the half-cell reaction will be (in V)
C
u
⊕
+
e
−
→
C
u
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Solution
C
u
2
+
+
e
−
→
C
u
⊕
;
E
⊖
=
1.77
V
⇒
Δ
G
⊖
1
=
−
1
×
F
×
(
1.77
)
=
−
1.77
F
C
u
2
+
+
e
−
→
C
u
⇒
Δ
G
⊖
2
=
−
2
×
F
×
(
−
0.34
)
=
−
0.68
F
C
u
o
p
l
u
s
+
e
−
→
C
u
Δ
G
⊖
=
Δ
G
⊖
2
−
Δ
⊖
1
⇒
−
1
×
F
×
E
⊖
=
[
0.68
−
(
−
1.77
)
]
F
⇒
E
⊖
=
−
2.45
V
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Similar questions
Q.
E
o
values for the half cell reactions are given:
C
u
2
+
+
e
−
→
C
u
+
;
E
o
=
0.15
V
C
u
2
+
+
2
e
−
→
C
u
;
E
o
=
0.34
V
What will be the
E
o
of the half-cell:
C
u
+
+
e
−
→
C
u
?
Q.
What is
E
⊖
r
e
d
for the reaction;
C
u
2
+
+
2
e
−
→
C
u
in the half cell
P
t
s
2
−
|
C
U
S
|
C
u
if
E
⊖
C
u
2
+
|
C
u
is 0.34 and
K
s
p
o
f
C
u
S
=
10
−
35
?
Q.
If for the half cell reactions
C
u
2
+
+
e
−
→
C
u
+
E
o
=
0.15
V
C
u
2
+
+
2
e
−
→
C
u
E
o
=
0.34
V
Calculate
E
o
of the half cell reaction
C
u
+
+
e
−
→
C
u
also predict whether
C
u
+
undergoes disproportionation or not.
Q.
Calculate the
E
and
E
∘
of the cell
N
i
|
N
i
2
+
|
|
C
u
2
+
|
C
u
from the following half-cell reactions:
N
i
2
+
+
2
e
−
→
N
i
;
E
∘
=
−
0.25
v
o
l
t
C
u
2
+
+
2
e
−
→
C
u
;
E
∘
=
+
0.34
v
o
l
t
(Given:
[
N
i
2
+
]
=
1
M
and
[
C
u
2
+
]
=
10
−
3
M
)
.
Q.
The standard reduction potential
E
∘
, for the half reaction are:-
Z
n
→
Z
n
2
+
+
2
e
−
;
E
∘
=
0.76
V
C
u
→
C
u
2
+
+
2
e
−
;
E
∘
=
0.34
V
The emf for the cell reaction,
Z
n
(
s
)
+
C
u
2
+
→
Z
n
2
+
+
C
u
(
s
)
is_____________.
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