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JEEMAIN and NEET
>>
Physics
>>
Class11
>>
Thermodynamics
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Q)
If the values of
Δ
H
∘
f
f
o
r
C
H
4
(
g
)
,
C
2
H
6
(
g
)
,
C
O
2
(
g
)
a
n
d
H
2
O
(
l
)
are respectively
−
74.85
,
−
84.68
,
−
393.5
a
n
d
−
286
k
J
/
m
o
l
,
predict which is more efficient fuel?
(
A
)
e
t
h
a
n
e
(
B
)
m
e
t
h
a
n
e
(
C
)
B
o
t
h
a
r
e
e
q
u
a
l
l
y
e
f
f
i
c
i
e
n
t
(
D
)
C
a
n
′
t
b
e
d
e
t
e
r
m
i
n
e
d
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