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Question
Chemistry
The species which by definition has zero standard molar enthalpy of formation at 298 K is
Q. The species which by definition has zero standard molar enthalpy of formation at
298
K
is
3536
208
IIT JEE
IIT JEE 2010
Thermodynamics
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A
B
r
2
(
g
)
11%
B
C
l
2
(
g
)
51%
C
H
2
O
(
g
)
27%
D
C
H
4
(
g
)
11%
Solution:
Elements in its standard state have zero enthalpy of formation.
C
l
2
is gas at room temperature, therefore
Δ
H
f
∘
of
C
l
2
(
g
)
is zero