- A. Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point
- B. Entropy of a system decreases with the evolution of heat
- C. Change of internal energy is negative for exothermic reactions
- D. The accentric factor for all materials is always more than one
Chemical Engineering Thermodynamics
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Pick out the wrong statement.
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Filling of gas from a high pressure cylinder into small bottles is an example of a/an __________ process.
- A. Equilibrium
- B. Adiabatic
- C. Steady
- D. Unsteady
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The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of
- A. T
- B. T and P
- C. T, P and Z
- D. T and Z
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Free energy
- A. Decreases in all spontaneous (or irreversible) processes
- B. Change during a spontaneous process has a negative value
- C. Remains unchanged in reversible processes carried at constant temperature and pressure
- D. All of the above
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Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is
- A. 0
- B. 1
- C. ∞
- D. None of these
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One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is
- A. 30554
- B. 10373
- C. 4988.4
- D. 4364.9
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The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.
- A. Increases
- B. Decreases
- C. Remains unchanged
- D. Decreases linearly
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A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.
- A. 2.73
- B. 28.3
- C. 273
- D. 283
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The unit of equilibrium constant of a chemical reaction is the same as that of
- A. Molar concentration
- B. Temperature
- C. Internal energy
- D. None of these
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Pick out the wrong statement.
- A. Cp of monoatomic gases such as metallic vapor is about 5 kcal/kg. atom
- B. The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state
- C. There is an increase in entropy, when a spontaneous change occurs in an isolated system
- D. At absolute zero temperature, the heat capacity for many pure crystalline substances is zero