For a spontaneous process, free energy is zero increases decreases whereas the e

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Question
For a spontaneous process, free energy
Options
A. is zero
B. increases
C. decreases whereas the entropy increases
D. and entropy both decrease

Correct Answer

decreases whereas the entropy increases

Chemical Engineering Thermodynamics problems

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1. Boyle's law for gases states that
Options
A. , when temperature is constant.
B. , when temperature & mass of the gas remain constant.
C. P ? V, at constant temperature & mass of the gas.
D. = constant, for any gas.

2. "At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the
Options
A. third law of thermodynamics
B. second law of thermodynamics
C. Nernst heat theorem
D. Maxwell's relations

5. For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.
Options
A. decreases
B. increases
C. remains same
D. decreases linearly

6. Pick out the wrong statement pertaining to the decomposition of PCl₅ represented by, PCl₅ ⇌ PCl₃ + Cl₂.Degree of dissociation of PCl₅ will
Options
A. decrease on addition of Cl₂.
B. increase on addition of an inert gas at constant pressure.
C. decrease on increasing the pressure of the system.
D. none of these

7. Pick out the correct statement:
Options
A. In an isothermal system, irreversible work is more than reversible work.
B. Under reversible conditions, the adiabatic work is less than isothermal work.
C. Heat, work, enthalpy and entropy are all 'state functions'.
D. Matter and energy can not be exchanged with the surroundings in a closed system.

8. A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?
Options
A. Vapor compression cycle using expansion valve.
B. Air refrigeration cycle.
C. Vapor compression cycle using expansion engine.
D. Carnot refrigeration cycle.

9. The accentric factor of a materical, '?', is defined as ? = -log₁₀(P_r^sat)T_r^-1 = 0.7, where, P_r^sat = reduced vapor pressure, T_r = reduced temperature. The value of accentric factor is always
Options
A. > 2
B. < 1
C. > 1
D. < 3

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