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Byju's Answer
Standard XII
Chemistry
Redox Reactions and Couple
Δ G∘f standar...
Question
Δ
G
∘
f
(standard free energy of formation) of
Z
n
O
and
C
O
are
−
318.2
kJmol
−
1
and
−
317.2
kJmol
−
1
respectively.
Is reduction of
Z
n
O
by carbon possible?
If yes enter 1. else enter 0.
Open in App
Solution
Z
n
O
+
C
→
Z
n
+
C
O
Δ
∘
=
Δ
G
∘
f
(
C
O
)
−
Δ
G
∘
f
(
Z
n
O
)
=
−
137.3
−
(
−
318.2
)
=
180.9
kJmol
−
1
Positive values of
Δ
G
∘
indicates that reaction in non-spontaneous.
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0
Similar questions
Q.
Δ
G
o
f
(standard free energy of formation) of
Z
n
O
and
C
O
are -318.2 kJ mol
−
1
and -137.3 kJ mol
−
1
respectively.
Z
n
O
+
C
⟶
Z
n
+
C
O
The approximate value of
Δ
G
o
f
in kJmol
−
1
for the above reaction is _______kJ mol
−
1
.
[Write your answer in form of inearest integer]
Q.
Following method of extracting
Z
n
is based on thermodynamics
A :
2
Z
n
S
+
3
O
2
⟶
2
Z
n
O
+
2
S
O
2
B :
Z
n
O
+
C
⟶
Z
n
+
C
O
If
△
G
o
f
(standard free energies of formation, in
k
J
m
o
l
−
1
) of
Z
n
S
=
−
205.4
,
Z
n
O
=
−
318.0
,
S
O
2
=
−
300.4
and of
C
O
=
−
137.3
Free energy changes of the above reaction A and B (respectively) will be :
Q.
Z
n
O
,
T
i
O
2
and
V
2
O
5
are oxides of d-block elements. If all of three are amphoteric enter 1, else enter 0.
Q.
Carbon cannot be used to reduce
A
l
2
O
3
to Al while
Z
n
O
can be reduced by carbon.
If it is true enter 1, else enter 0.
Q.
We use
Z
n
O
in paints instead of
P
b
2
+
salts.
If true enter 1, else enter 0.
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