- A. < 0
- B. > 0
- C. = 0
- D. None of these
Chemical Engineering Thermodynamics
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When a system is in equilibrium for all possible processes, the differential or finite change of entropy is_____.
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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
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With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure_____.
- A. Increases
- B. Decreases
- C. Remains same
- D. Decreases linearly
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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. Clayperon-Claussius equation
- C. Van Laar equation
- D. Nernst Heat Theorem
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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
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The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is_____.
- A. ∞
- B. 1
- C. 0
- D. -ve
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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
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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
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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
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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