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Byju's Answer
Standard XII
Chemistry
Electrochemical Cells, Galvanic Cells
For the follo...
Question
For the following half cell reactions,
E
o
values are also given:
M
n
2
+
+
2
H
2
O
→
M
n
O
2
+
4
H
+
+
2
e
−
;
E
o
=
−
1.23
V
M
n
O
−
4
+
4
H
+
+
3
e
−
→
M
n
O
2
+
2
H
2
O
;
E
o
=
+
1.70
V
Select the correct statements.
A
M
n
2
+
reacts with
M
n
O
−
4
in acid solution to form
M
n
O
2
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B
M
n
(
M
n
O
4
)
2
is stable in acid solution
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C
M
n
O
2
disproportionates to
M
n
2
+
and
M
n
O
−
4
in acid solution
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D
None of the above
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Solution
The correct option is
A
M
n
2
+
reacts with
M
n
O
−
4
in acid solution to form
M
n
O
2
2
M
n
O
−
4
+
3
M
n
2
+
+
2
H
2
O
⟶
5
M
n
O
2
+
4
H
+
;
E
o
=
0.47
V
Thus, cell reaction in which
M
n
2
+
on reaction with
M
n
O
−
4
froms
M
n
O
2
in acidic medium.
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Similar questions
Q.
M
n
O
−
4
+
8
H
+
+
5
e
−
→
M
n
2
+
+
4
H
2
O
;
E
O
=
1.51
V
;
Δ
G
0
1
=
−
5
×
1.51
×
F
M
n
O
2
+
4
H
+
+
2
e
−
→
M
n
2
+
+
2
H
2
O
;
E
O
=
1.23
V
;
Δ
G
0
2
=
−
5
×
1.23
×
F
E
∘
M
n
O
−
4
|
M
n
O
2
is
Q.
The following two redox reactions are given:
i)
M
n
O
−
4
+
8
H
+
+
5
e
−
→
M
n
2
+
+
4
H
2
O
;
E
o
=
X
1
V
ii)
M
n
O
2
+
4
H
+
+
2
e
−
→
M
n
2
+
+
2
H
2
O
;
E
o
=
X
2
V
Find
E
o
for the following reaction.
M
n
O
−
4
+
4
H
+
+
3
e
−
→
M
n
O
2
+
2
H
2
O
Q.
E
o
R
P
and their respective half reactions for some changes are given below:
(a)
M
n
O
−
4
(
a
q
)
+
8
H
+
+
5
e
→
M
n
2
+
(
a
q
)
+
4
H
2
O
(
l
)
;
E
o
=
+
1.52
V
(b)
M
n
O
2
−
4
(
a
q
)
+
4
H
+
+
2
e
→
M
n
O
2
(
s
)
+
2
H
2
O
(
l
)
;
E
o
=
+
2.26
V
(c)
2
M
n
O
−
4
(
a
q
)
+
2
e
→
2
M
n
O
2
−
4
(
a
q
)
;
E
o
=
+
0.56
V
(acid med.)
(d)
M
n
3
+
+
e
→
M
n
2
+
;
E
o
=
+
1.51
V
(acid med.)
(e)
M
n
4
+
+
e
→
M
n
3
+
;
E
o
=
0.95
V
(acid med.)
The most stable oxidation state of Mn is :
Q.
Calculate the value of
E
∘
M
n
O
−
4
|
M
n
O
2
.
M
n
O
−
4
+
8
H
+
+
5
e
−
→
M
n
2
+
+
4
H
2
O
;
E
∘
=
1.51
V
M
n
O
2
+
4
H
+
+
2
e
−
→
M
n
2
+
+
2
H
2
O
;
E
∘
=
1.23
V
Q.
E
∘
for the half cells :
M
n
O
2
+
4
H
+
+
2
e
−
→
M
n
2
+
+
2
H
2
O
i
s
1.23
V
F
e
3
+
+
e
−
→
F
e
2
+
i
s
0.77
V
Which of the following statements is true?
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