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Byju's Answer
Standard X
Chemistry
Application of Electrolysis
The standard ...
Question
The standard reduction potentials at
298
K
for the following half reactions are given against each:
Z
n
2
+
(
a
q
)
+
2
e
⇌
Z
n
(
s
)
;
−
0.762
V
C
r
3
+
(
a
q
)
+
3
e
⇌
C
r
(
s
)
;
−
0.740
V
2
H
+
(
a
q
)
+
2
e
⇌
H
2
(
g
)
;
0.00
V
F
e
3
+
(
a
q
)
+
e
⇌
F
e
2
+
(
a
q
)
;
0.770
V
Which is the strongest reducing agent?
A
Z
n
(
s
)
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B
C
r
(
s
)
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C
H
2
(
g
)
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D
F
e
3
+
(
a
q
)
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Solution
The correct option is
B
Z
n
(
s
)
Since oxidation potential of
Z
n
is highest amongst the above given half cell hence it will be strongest reducing agent.
So, option A is correct.
Suggest Corrections
0
Similar questions
Q.
The standard reduction potentials at 298K for the following half cell reaction are given below:
Z
n
2
+
(
a
q
)
+
2
e
−
⇌
Z
n
(
s
)
;
E
o
=
−
0.762
V
C
r
3
+
(
a
q
)
+
3
e
−
⇌
C
r
(
s
)
;
E
o
=
+
0.762
V
2
H
+
(
a
q
)
+
2
e
−
⇌
H
2
(
g
)
;
E
o
=
+
0.00
V
F
e
3
+
(
a
q
)
+
e
−
⇌
F
e
2
+
(
a
q
)
;
E
o
=
+
0.770
V
Based on the above reactions, select the strongest reducing agent?
Q.
The standard reduction potentials at 298 K for the following half-cell reactions are given:
Z
n
2
+
(
a
q
)
+
2
e
−
⇌
Z
n
(
s
)
;
−
0.762
V
C
r
3
+
(
a
q
)
+
3
e
−
⇌
C
r
(
s
)
;
−
0.74
V
2
H
+
(
a
q
)
+
2
e
−
⇌
H
2
(
g
)
;
+
0.00
V
F
e
3
+
(
a
q
)
+
e
−
⇌
F
e
2
+
(
a
q
)
;
+
0.77
V
Which one of the following is the strongest reducing agent?
Q.
The standard reduction potential at 298 K for following half reactions are given against each
Z
n
2
+
(
a
q
)
+
2
e
−
⇌
Z
n
(
s
)
;
−
0.762
C
r
3
+
(
a
q
)
+
3
e
−
⇌
C
r
(
s
)
;
−
0.740
2
H
⨁
(
a
q
)
+
2
e
−
⇌
H
2
(
g
)
;
0.000
F
e
3
+
(
a
q
)
+
3
e
−
⇌
F
e
2
+
(
a
q
)
;
0.770
Which is the strongest reducing agent ?
Q.
The standard reduction potentials at
25
∘
C
for the following half reactions are given against each;
Z
n
2
+
(
a
q
.
)
+
2
e
−
⇌
Z
n
(
s
)
;
−
0.762
C
r
3
+
(
a
q
.
)
+
3
e
−
⇌
C
r
(
s
)
;
−
0.740
2
H
+
+
2
e
−
⇌
H
2
(
g
)
;
0.00
F
e
3
+
+
e
−
⇌
F
e
2
+
;
0.77
Which is the strongest reducing agent?
Q.
The standard reduction potentials at
298
K
for the following half-cell reactions are given by
Z
n
2
+
(
a
q
)
+
2
e
−
⇌
Z
n
(
s
)
−
0.762
C
r
3
+
(
a
q
)
+
3
e
−
⇌
C
r
(
s
)
−
0.74
2
H
+
(
a
q
)
+
2
e
−
⇌
H
2
(
g
)
+
0.00
F
e
3
+
(
a
q
)
+
e
−
⇌
F
e
2
+
(
a
q
)
+
0.77
Which one of the following is the strongest reducing agent?
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