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Byju's Answer
Standard X
Chemistry
Electrochemical Series
Coke does cau...
Question
Coke does cause reduction of
A
l
2
O
3
.
Δ
G
∘
f
(in
k
J
m
o
l
−
1
) for
A
l
2
O
3
:
−
1582
C
O
:
−
137.2
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Solution
A
l
2
O
3
+
C
→
2
A
l
+
3
C
O
Δ
G
∘
=
3
Δ
G
∘
f
(
C
O
)
−
Δ
G
∘
f
(
A
l
2
O
3
)
=
−
3
(
137.2
)
+
1582
=
+
v
e
.
Hence, reaction is not spontaneous.
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Similar questions
Q.
The value of
Δ
f
G
0
for
C
r
2
O
3
is
540
kJ mol
−
1
and that of
A
l
2
O
3
is
−
827
kJ mol
−
1
. Is the reduction of
C
r
2
O
3
by
A
l
is feasible reaction?
Q.
The value of
Δ
r
G
∘
for
C
r
2
O
3
is
−
540
kJ mol
−
1
and that of
A
l
2
O
3
is
−
827
kJ mol
−
1
. Is the reduction of
C
r
2
O
3
by
A
l
is feasible reaction?
Q.
The Gibbs energy for the decomposition of
A
l
2
O
3
at
500
o
C
is as follows:
2
3
A
l
2
O
3
→
4
3
A
l
+
O
2
,
Δ
r
G
=
+
966
k
J
m
o
l
−
1
The potential difference needed for electrolytic reduction of
A
l
2
O
3
at
500
o
C
is at least:
Q.
Carbon cannot be used in the reduction of
A
l
2
O
3
because:
Q.
On the basic of information availbale from the relation
4
3
A
l
+
O
2
→
2
3
A
l
2
O
3
,
Δ
G
=
−
827
kJ mol
−
1
of
O
2
, the minimum emf required to carry out electrolysis of
A
l
2
O
3
is:
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