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Byju's Answer
Standard XII
Chemistry
Hess' Law
The standard ...
Question
The standard reaction Gibbs energy for a chemical reaction at an absolute temperature
T
is given by:
Δ
r
G
o
=
A
−
B
T
Where
A
and
B
are non-zero constants. Which of the following is true about this reaction?
A
Exothermic if
B
<
0
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B
Exothermic is
A
>
0
and
B
<
0
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C
Endothermic if
A
<
0
and
B
>
0
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D
Endothermic if
A
>
0
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Solution
The correct option is
D
Endothermic if
A
>
0
Gibb's free energy
(
Δ
G
)
:
Δ
G
=
Δ
H
−
T
Δ
S
where,
Δ
G
=
Gibb's free energy
Δ
H
=
enthalpy of the reaction
Δ
S
=
entropy change
T
=
temperature
Under standard condition:
Δ
G
0
=
Δ
H
0
−
T
Δ
S
0
≡
Δ
G
0
=
A
−
B
T
For a spontaneous process,
Δ
G
must be negative.
Δ
G
0
=
A
−
B
T
=
−
v
e
Δ
H
<
T
Δ
S
-----(1)
A
=
Δ
H
can
−
v
e
or
+
v
e
if the condition of eqn (1) is satisfied.
Δ
H
=
A
=
+
v
e
→
Endothermic
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Q.
The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given
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r
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