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Byju's Answer
Standard XII
Chemistry
EMF
Calculate the...
Question
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
)
.
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Solution
E
∘
c
e
l
l
=
0.34
+
035
=
0.59
V
E
c
e
l
l
=
E
∘
c
e
l
l
−
R
T
n
F
l
n
Q
=
0.59
−
(
8.314
)
(
298
)
(
2
)
(
96500
)
l
n
[
N
i
2
+
]
[
C
u
2
+
]
C
u
2
+
+
N
i
⟶
N
i
2
+
+
C
u
=
0.59
−
(
0.0128
)
l
n
(
1
10
−
3
)
=
0.59
−
(
2.303
)
(
0.0128
)
(
3
)
=
0.5015
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1
Similar questions
Q.
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
Q.
During electrolysis,
O
2
(
g
)
is evolved at anode in
⎡
⎢ ⎢ ⎢ ⎢ ⎢
⎣
(
c
o
r
r
e
c
t
)
C
u
(
s
)
⟶
C
u
2
+
(
a
q
)
+
2
e
−
E
⊝
C
u
|
C
u
2
+
=
−
0.34
V
(
w
r
o
n
g
)
2
H
2
O
(
l
)
⟶
O
2
(
g
)
+
4
H
⊕
(
a
q
)
+
4
e
−
E
⊝
H
2
O
|
O
2
=
−
1.23
V
⎤
⎥ ⎥ ⎥ ⎥ ⎥
⎦
I
n
(
d
)
⎡
⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢
⎣
(
c
o
r
r
e
c
t
)
N
i
(
s
)
⟶
N
i
2
+
(
a
q
)
+
2
e
−
E
⊝
N
i
|
N
i
2
+
=
−
0.25
V
(
w
r
o
n
g
)
4
⊝
O
H
(
a
q
)
⟶
O
2
(
g
)
+
2
H
2
O
(
l
)
+
4
e
−
E
⊕
⊝
O
H
|
O
2
=
−
0.4
V
⎤
⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥
⎦
Q.
What is an electrochemical theory of rusting of irons and give two methods of preventing of rusting of iron?
Write the Nernst equation and calculate the emf of following cell at 298 K :
N
i
|
N
i
2
+
(0.01)||
C
u
2
+
|
C
u
(
0.01
M
)
Given
E
∘
(
C
u
2
+
/ Cu) = + 0.34V,
E
∘
(
N
I
2
+
/ Ni) = -0.22V
Q.
C
u
⊕
+
e
−
→
C
u
,
E
⊖
=
x
1
volt
C
u
2
+
+
2
e
−
→
C
u
,
E
⊖
=
x
2
volt, then for
C
u
2
+
+
e
−
→
C
u
,
E
⊖
(volt) will be:
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
?
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