The Second Law of Thermodynamics (Spontaneity of Processes; ΔS of the Universe and ΔG of the System as Criteria for Spontaneity...) NEET Questions

Physical Chemistry - Chemical Thermodynamics

The Second Law of Thermodynamics (Spontaneity of Processes; ΔS of the Universe and ΔG of the System as Criteria for Spontaneity...) MCQ Questions


7.
For a non-spontaneous reaction, Gibbs free energy change (ΔG) is
A.
Positive
B.
Negative
C.
Zero
D.
Equal to enthalpy
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ANSWER :
A. Positive
8.
A reaction is spontaneous at high temperature if
A.
ΔH is negative and ΔS is negative
B.
ΔH is positive and ΔS is positive
C.
ΔH is positive and ΔS is negative
D.
ΔH is negative and ΔS is positive
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ANSWER :
B. ΔH is positive and ΔS is positive
9.
Which process has the highest entropy increase?
A.
Condensation
B.
Freezing
C.
Melting
D.
Vaporization
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ANSWER :
D. Vaporization
10.
The relationship between Gibbs free energy and equilibrium constant is
A.
ΔG° = -RT lnK
B.
ΔG° = RT lnK
C.
ΔG° = -RT/K
D.
ΔG° = RT/K
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ANSWER :
A. ΔG° = -RT lnK
11.
Which of the following reactions is always spontaneous?
A.
Freezing of water
B.
Vaporization of water
C.
Combustion of methane
D.
Formation of ice at room temperature
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ANSWER :
C. Combustion of methane
12.
When ΔG = 0, the reaction is
A.
Spontaneous
B.
Non-spontaneous
C.
At equilibrium
D.
Irreversible
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ANSWER :
C. At equilibrium