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Byju's Answer
Standard XI
Chemistry
Enthalpy
In which of t...
Question
In which of the following reactions
Δ
H
is equal to
Δ
U
?
A
C
3
H
8
(
g
)
+
5
O
2
(
g
)
→
3
C
O
2
(
g
)
+
4
H
2
O
(
g
)
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B
2
S
O
2
(
g
)
+
O
2
(
g
)
→
2
S
O
3
(
g
)
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C
N
2
(
g
)
+
3
H
2
(
g
)
→
2
N
H
3
(
g
)
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D
C
H
4
(
g
)
+
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
g
)
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Solution
The correct option is
D
C
H
4
(
g
)
+
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
g
)
We know,
Δ
H
=
Δ
U
+
Δ
n
g
R
T
when
Δ
n
g
=
0
. Then,
Δ
H
=
Δ
U
for (a)
so,
Δ
n
g
=
7
−
6
=
1
. So,
Δ
H
is not equal to
Δ
U
for (b)
⇒
Δ
n
g
=
2
−
3
=
−
1
.
for (c)
⇒
Δ
n
g
=
2
−
4
=
−
2
.
For (d),
Δ
n
g
=
0
. Then,
Δ
H
=
Δ
U
Clearly, (d) is correct.
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0
Similar questions
Q.
For which of the following reactions,
Δ
H
≠
Δ
U
?
Q.
Choose the reaction in which
Δ
H
is not equal to
Δ
U
.
Q.
In which of the following reactions,
Δ
H
>
Δ
U
?
Q.
For which of the following
Δ
H
is not equal to
Δ
U
Q.
Assertion :In the following reaction:
C
(
s
)
+
O
2
(
g
)
⟶
C
O
2
(
g
)
;
Δ
H
=
Δ
U
−
R
T
Reason:
Δ
H
is related to
Δ
U
by the equation,
Δ
H
=
Δ
U
−
n
g
R
T
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