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Byju's Answer
Standard XII
Chemistry
Ion Electron Method
Balance the f...
Question
Balance the following redox reaction:
C
r
+
+
S
n
4
+
→
C
r
3
+
+
S
n
2
+
A
C
r
+
+
S
n
4
+
→
C
r
3
+
+
S
n
2
+
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B
3
C
r
+
+
S
n
4
+
→
C
r
3
+
+
2
S
n
2
+
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C
C
r
+
+
4
S
n
4
+
→
C
r
3
+
+
2
S
n
2
+
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D
C
r
+
+
4
S
n
4
+
→
3
C
r
3
+
+
2
S
n
2
+
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Solution
The correct option is
B
3
C
r
+
+
S
n
4
+
→
C
r
3
+
+
2
S
n
2
+
C
r
+
+
S
n
4
+
⟶
C
r
3
+
+
S
n
2
+
Oxidation-reduction method :
C
r
+
⟶
C
r
3
+
+
2
e
−
S
n
4
+
+
2
e
−
⟶
S
n
2
+
o
x
i
d
a
t
i
o
n
r
e
d
u
c
t
i
o
n
Adding both equations,
C
r
+
+
S
n
4
+
⟶
C
r
3
+
+
S
n
2
+
.
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0
Similar questions
Q.
Based on the given reaction, identify the correct statement.
C
r
+
+
S
n
4
+
→
C
r
3
+
+
S
n
2
+
Q.
2
S
n
2
+
→
S
n
4
+
+
S
n
This reaction is an example of:
Q.
Standard electrode potential for
S
n
4
+
|
S
n
2
+
couple is
+
0.15
V
and that for the
C
r
3
+
|
C
r
couple is
−
0.74
V
, these two couples in their standard state are connected to make a cell potential will be:
Q.
Given,
E
∘
C
r
3
+
/
C
r
=
−
0.72
V
,
E
∘
F
e
2
+
/
F
e
=
−
0.42
V
.
The potential for the cell
C
r
|
C
r
3
+
(
0.1
M
)
|
|
F
e
2
+
(
0.01
M
)
|
F
e
is:
Q.
Given
E
∘
C
r
3
+
/
C
r
=
−
0.72
,
E
∘
F
e
2
+
/
F
e
=
−
0.42
V
The potential for the cell,
C
r
|
C
r
3
+
(
0.1
M
)
|
|
F
e
2
+
(
0.01
M
)
|
F
e
is:
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