Free Mass Transfer Operations MCQs with Answers
669 Mass Transfer Operations MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. 80.38
- B. 80
- C. 79.62
- D. 78.51
Explanation: Relative humidity gives a vapour partial pressure of 0.80 × 17.5 = 14 mm Hg.
Correct answer: 79.62- A. Nature of the liquid
- B. Temperature of the liquid
- C. Nature of the gas
- D. Total pressure
Explanation: For an ideal gas saturated with vapour, the vapour partial pressure is fixed by the liquid's vapour pressure at the temperature, and its…
Correct answer: Nature of the gas- A. Henry's
- B. Raoult's
- C. Amagat's
- D. None of these
Explanation: Henry’s law states that, at dilute concentrations, the equilibrium dissolved concentration or mole fraction of a gas is proportional to…
Correct answer: Henry's- A. 180
- B. 60.3
- C. 720
- D. 200
Explanation: Convert the mass humidity to a mole ratio: ybenzene/yN2 = 0.2(28/78) = 0.0718.
Correct answer: 60.3- A. Temperature
- B. Nature of solute
- C. Pressure
- D. Nature of solvent
Explanation: Pressure has a negligible effect on the solubility of most solid or liquid solutes, whereas temperature and the chemical nature of both…
Correct answer: Pressure- A. Bisulphite
- B. Chloride
- C. Thiosulphate
- D. Carbonate (monohydrate)
Explanation: Sodium carbonate monohydrate shows retrograde or inverted solubility over the relevant temperature range, so cooling can increase its…
Correct answer: Carbonate (monohydrate)- A. Pressure
- B. Nature of the solvent
- C. Temperature
- D. Nature of the solute
Explanation: Pressure has very little effect on the solubility of solids or liquids in a solvent, while solute and solvent nature and temperature…
Correct answer: Pressure- A. Sodium carbonate monohydrate
- B. Sodium chloride
- C. Anhydrous sodium sulphate
- D. Hypo
Explanation: Sodium chloride has a very small change in solubility over the usual temperature range, unlike many salts whose solubility rises…
Correct answer: Sodium chloride- A. Higher than
- B. Equal to
- C. Smaller than
- D. Either A. or B.; depends on the system
Explanation: Percentage saturation is based on humidity, while relative saturation is based on the ratio of vapour partial pressure to saturation…
Correct answer: Smaller than- A. 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar
- B. 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar
- C. 1 lb/hr.ft2 = 4.8823 kg/hr.m2
- D. 1 kg/hr.m2 = 4.8823 lb/hr.ft2
Explanation: Since 1 kg equals about 2.2046 lb and 1 m2 equals 10.764 ft2, 1 kg/(h·m2) equals about 0.2048 lb/(h·ft2), not 4.8823.
Correct answer: 1 kg/hr.m2 = 4.8823 lb/hr.ft2- A. Azeotropic
- B. Saturated
- C. Supersaturated
- D. Ideal
Explanation: An azeotrope boils and distils without a change in vapour or liquid composition because both phases have the same composition at that…
Correct answer: Azeotropic- A. Solvent is from low concentration to high concentration region
- B. Solvent is from high concentration to low concentration region
- C. Solute takes place
- D. None of these
Explanation: In osmosis, solvent passes through the semipermeable membrane from the dilute solution, having lower solute concentration, toward the…
Correct answer: Solvent is from low concentration to high concentration region- A. Have no definite shape
- B. Move faster
- C. Are held together by stronger inter-molecular forces
- D. Are heavier
Explanation: Liquid molecules are more strongly held by intermolecular forces, which restricts their movement and lowers diffusivity.
Correct answer: Are held together by stronger inter-molecular forces- A. 1
- B. 2
- C. 3
- D. 4
Explanation: A colloid contains dispersed particles and a continuous dispersion medium.
Correct answer: 215. Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a __________________?
- A. Straight line
- B. Sine curve
- C. Parabola
- D. Hyperbola
Explanation: For an ideal solution, the heat of mixing is zero, so the enthalpy varies linearly with composition at a fixed temperature.
Correct answer: Straight line- A. Followed from Margules equation
- B. The distribution law
- C. A corollary of Henry's law
- D. None of these
Explanation: The distribution law states that a solute at equilibrium has a constant concentration ratio between two immiscible solvents at fixed…
Correct answer: The distribution law- A. Pressure
- B. Solubility
- C. Temperature
- D. None of these
Explanation: Henry's law is most closely followed when the gas has very low solubility in the liquid, not extremely high solubility.
Correct answer: None of these- A. Liquid extraction
- B. Evaporation
- C. Drying
- D. Distillation
Explanation: Distribution law describes how a solute divides between two immiscible solvents, which is the fundamental principle of liquid-liquid…
Correct answer: Liquid extraction- A. HF
- B. Both B. & C.
- C. H2S
- D. SO2
Explanation: Ethanolamines chemically absorb acidic gases such as hydrogen sulphide and sulphur dioxide through reversible reactions.
Correct answer: Both B. & C.- A. Isopropyl alcohol
- B. Toluene
- C. Butyl alcohol
- D. Hexane
Explanation: n-Butyl alcohol selectively extracts phosphoric acid from the hydrochloric-acid leach liquor, while calcium chloride remains mainly in the…
Correct answer: Butyl alcoholMass Transfer Operations MCQs: common questions
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