Q. Which of the following statements is true about Gibbs Free Energy?
A.
ΔG is always positive for spontaneous processes.
B.
ΔG = ΔH - TΔS.
C.
ΔG can never be zero.
D.
ΔG is independent of temperature.
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Solution
The correct equation for Gibbs Free Energy is ΔG = ΔH - TΔS, which relates enthalpy, entropy, and temperature.
Correct Answer: B — ΔG = ΔH - TΔS.
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Q. Which of the following statements is true about the second law of thermodynamics?
A.
Energy can be created
B.
Entropy of an isolated system always decreases
C.
Entropy of an isolated system always increases
D.
Energy can be destroyed
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Solution
The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time.
Correct Answer: C — Entropy of an isolated system always increases
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Q. Which of the following statements is true according to the first law of thermodynamics?
A.
Energy can be created or destroyed.
B.
Energy can only be transformed from one form to another.
C.
The total energy of an isolated system decreases.
D.
Heat and work are the same forms of energy.
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Solution
The first law of thermodynamics states that energy can only be transformed from one form to another, not created or destroyed.
Correct Answer: B — Energy can only be transformed from one form to another.
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Q. Which of the following statements is true according to the second law of thermodynamics?
A.
Energy can be created
B.
Entropy of the universe decreases
C.
Heat cannot spontaneously flow from a colder body to a hotter body
D.
All processes are reversible
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Solution
The second law states that heat cannot spontaneously flow from a colder body to a hotter body, which implies that entropy of the universe tends to increase.
Correct Answer: C — Heat cannot spontaneously flow from a colder body to a hotter body
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Q. Which of the following statements is true for an adiabatic process?
A.
Heat is exchanged with the surroundings
B.
The system is insulated from heat transfer
C.
Temperature remains constant
D.
Pressure remains constant
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Solution
In an adiabatic process, the system is insulated from heat transfer, meaning no heat is exchanged with the surroundings.
Correct Answer: B — The system is insulated from heat transfer
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Q. Which of the following statements is true for an isobaric process?
A.
Pressure remains constant
B.
Volume remains constant
C.
Temperature remains constant
D.
Internal energy remains constant
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Solution
In an isobaric process, the pressure remains constant.
Correct Answer: A — Pressure remains constant
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Q. Which of the following statements is true regarding enthalpy?
A.
Enthalpy is a state function
B.
Enthalpy depends on the path taken
C.
Enthalpy cannot be measured
D.
Enthalpy is always positive
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Solution
Enthalpy is a state function, meaning it depends only on the initial and final states, not the path taken.
Correct Answer: A — Enthalpy is a state function
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Q. Which of the following statements is true regarding entropy?
A.
Entropy is a state function.
B.
Entropy can never decrease.
C.
Entropy is independent of temperature.
D.
Entropy is always positive.
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Solution
Entropy is a state function, meaning it depends only on the state of the system and not on how it reached that state.
Correct Answer: A — Entropy is a state function.
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Q. Which of the following statements is true regarding Gibbs Free Energy?
A.
ΔG is always positive for spontaneous processes.
B.
ΔG = ΔH - TΔS.
C.
ΔG can never be negative.
D.
ΔG is independent of temperature.
Show solution
Solution
The correct equation for Gibbs Free Energy is ΔG = ΔH - TΔS, which relates enthalpy, entropy, and temperature.
Correct Answer: B — ΔG = ΔH - TΔS.
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