 A. < 0
 B. > 0
 C. = 0
 D. None of these
Chemical Engineering Thermodynamics

When a system is in equilibrium for all possible processes, the differential or finite change of entropy is_____.

Free energy changes for two reaction mechanism ‘X’ and ‘Y are respectively – 15 and – 5 units. It implies that X is_____.
 A. Slower than Y
 B. Faster than Y
 C. Three times slower than Y
 D. Three times faster than Y

With increase in reduced temperature, the fugacity coefficient of a gas at constant reduced pressure_____.
 A. Increases
 B. Decreases
 C. Remains same
 D. Decreases linearly

If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the_____.
 A. Maxwell’s equation
 B. ClayperonClaussius equation
 C. Van Laar equation
 D. Nernst Heat Theorem

Pick out the undesirable property for a good refrigerant.
 A. High thermal conductivity
 B. Low freezing point
 C. Large latent heat of vaporisation
 D. High viscosity

The JouleThomson coefficient is defined as (∂T/∂P)H. Its value at the inversion point is_____.
 A. ∞
 B. 1
 C. 0
 D. ve

Free energy, fugacity and activity coefficient are all affected by change in the temperature. The fugacity coefficient of a gas at constant pressure _____ with the increase of reduced temperature.
 A. Decreases
 B. Increases
 C. Remains constant
 D. Decreases logarithmically

At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is_____.
 A. Zero
 B. One
 C. Infinity
 D. Negative

Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl₂.Degree of dissociation of PCl5 will_____.
 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

At a given temperature, the volume of a gas dissolved in a solvent _____ with increase in pressure.
 A. Increases
 B. Decreases
 C. Remains unchanged
 D. May increase or decrease; depends on the gas