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.
A spontaneous process is one which:
A.
Occurs only at high temperature
B.
Always occurs at fast rate
C.
Requires an external agency to proceed
D.
Has the potential to proceed without external help
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ANSWER :
D. Has the potential to proceed without external help
2.
Which of the following is TRUE about a spontaneous process?
A.
It is always exothermic
B.
It is always endothermic
C.
It is irreversible and may only be reversed by external agency
D.
It always occurs rapidly
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ANSWER :
C. It is irreversible and may only be reversed by external agency
3.
The first law of thermodynamics:
A.
Gives the equilibrium constant
B.
Predicts the direction of spontaneous change
C.
Tells about energy conservation but not direction
D.
Determines the rate of reaction
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ANSWER :
C. Tells about energy conservation but not direction
4.
Spontaneity of a process indicates:
A.
The rate at which the process occurs
B.
The feasibility of the process
C.
The temperature of the process
D.
The pressure of the process
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ANSWER :
B. The feasibility of the process
5.
Hydrogen and oxygen mixed at room temperature do not visibly react. Yet the formation of water is spontaneous. This is because:
A.
Spontaneity refers to feasibility, not rate
B.
First law is violated
C.
The reaction is not actually spontaneous
D.
Water is unstable
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ANSWER :
A. Spontaneity refers to feasibility, not rate
6.
Decrease in enthalpy alone is:
A.
A sufficient criterion for spontaneity
B.
Always required for spontaneity
C.
Not a sufficient criterion for spontaneity
D.
The only criterion needed
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ANSWER :
C. Not a sufficient criterion for spontaneity