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.
Which of the following is an example of an endothermic spontaneous process?
A.
Combustion of methane
B.
Melting of ice at 25°C
C.
Formation of HCl from H₂ and Cl₂
D.
Formation of NH₃ from N₂ and H₂
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ANSWER :
B. Melting of ice at 25°C
8.
For the reaction ½N₂(g) + O₂(g) → NO₂(g), ΔrH° = +33.2 kJ/mol. This reaction:
A.
Can be spontaneous despite ΔH > 0 due to entropy considerations
B.
Is at equilibrium always
C.
Is non-spontaneous because ΔH > 0
D.
Cannot occur
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ANSWER :
A. Can be spontaneous despite ΔH > 0 due to entropy considerations
9.
Entropy (S) is a measure of:
A.
Randomness or disorder of the system
B.
Heat content of the system
C.
Energy of the system
D.
Heat capacity of the system
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ANSWER :
A. Randomness or disorder of the system
10.
Entropy is:
A.
Always negative
B.
Independent of temperature
C.
A state function
D.
A path function
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ANSWER :
C. A state function
11.
Among solid, liquid, and gas phases of the same substance, entropy is:
A.
Gas > Liquid > Solid
B.
Solid > Liquid > Gas
C.
All have equal entropy
D.
Liquid > Solid > Gas
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ANSWER :
A. Gas > Liquid > Solid
12.
The crystalline solid state of a substance is:
A.
The state of lowest entropy
B.
Always at zero entropy
C.
The state of highest entropy
D.
Independent of entropy
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ANSWER :
A. The state of lowest entropy