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


1.
Which thermodynamic quantity determines spontaneity of a process?

NEET - 2019

A.
Enthalpy
B.
Entropy
C.
Gibbs free energy
D.
Internal energy
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ANSWER :
C. Gibbs free energy
2.
The second law of thermodynamics states that the entropy of the universe always
A.
Increases
B.
Decreases
C.
Remains constant
D.
Is unpredictable
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ANSWER :
A. Increases
3.
Which equation represents Gibbs free energy?
A.
ΔG = ΔH + TΔS
B.
ΔG = ΔH - TΔS
C.
ΔG = ΔH / T
D.
ΔG = TΔS - ΔH
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ANSWER :
B. ΔG = ΔH - TΔS
4.
What happens to entropy when ice melts into water?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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ANSWER :
A. Increases
5.
For a spontaneous reaction at all temperatures, ΔH should be __ and ΔS should be __
A.
Positive, Positive
B.
Negative, Positive
C.
Positive, Negative
D.
Negative, Negative
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ANSWER :
B. Negative, Positive
6.
Which of the following always increases in a spontaneous process?
A.
Enthalpy
B.
Entropy
C.
Gibbs free energy
D.
Internal energy
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ANSWER :
B. Entropy