A. Molal concentration difference
B. Molar free energy
C. Partial molar free energy
D. Molar free energy change
✅ The correct answer is option C.
Thermodynamics MCQs
142. Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ____with the increase of reduced temperature.
A. Decreases
B. Increases
C. Remains constant
D. Decreases logarithmically
✅ The correct answer is option B.
143. Chemical engineering thermodynamics is concerned with the __________ in/of chemical processes.
A. Reaction mechanism
B. Calculation of rates
C. Energy transformation from one form to the another
D. None of these
✅ The correct answer is option C.
144. Which is not constant for an ideal gas?
A. (∂P/∂V)T
B. (∂V/∂T)P
C. (∂P/∂V)V
D. All of the above
✅ The correct answer is option A.
145. The gas law (PV = RT) is true for an __________ change.
A. Isothermal
B. Adiabatic
C. Both A & B
D. Neither A nor B
✅ The correct answer is option C.
146. The standard state of a gas (at a given temperature) is the state in which fugacity is equal to
A. Unity
B. Activity
C. Both A & B
D. Neither A nor B
✅ The correct answer is option C.
147. The number of degrees of freedom for a mixture of ice and water (liquid) are
A. 2
B. 3
C. 1
D. 0
✅ The correct answer is option C.
148. 1st law of thermodynamics is nothing but the law of conservation of
A. Momentum
B. Mass
C. Energy
D. None of these
✅ The correct answer is option C.
149. The standard Gibbs free energy change of a reaction depends on the equilibrium
A. Pressure
B. Temperature
C. Composition
D. All of the above
✅ The correct answer is option B.
150. A refrigeration cycle is the same as a __________ cycle,
A. Turbine
B. Heat engine
C. Reversed heat engine
D. None of these
✅ The correct answer is option C.