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JEEMAIN and NEET
>>
Physics
>>
Class11
>>
Thermodynamics
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Q)
Given that,
N
H
3
+
3
C
l
2
(
g
)
→
N
C
l
3
(
g
)
+
3
H
C
l
(
g
)
;
Δ
H
1
=
−
x
1
N
2
(
g
)
+
3
H
2
(
g
)
→
2
N
H
3
(
g
)
;
Δ
H
2
=
−
x
2
H
2
(
g
)
+
C
l
2
(
g
)
→
2
H
C
l
(
g
)
;
Δ
H
3
=
x
3
The heat of formation of
N
C
l
3
(
g
)
from the above data is
(
A
)
–
x
1
+
x
2
/
2
–
x
3
(
B
)
x
1
+
x
2
/
2
–
x
3
(
C
)
x
1
−
x
2
/
2
–
x
3
(
D
)
–
x
1
−
x
2
/
2
–
x
3
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