A. Selectivity
B. Distribution co-efficient
C. Both A. and B.
D. Neither A. nor B.
Related Mcqs:
- In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?
A. The entire amount of C is transferred to solvent B
B. Less than 2 kg but more than 1 kg of C is transferred to solvent B
C. Less than 1 kg of C is transferred to B
D. No amount of C is transferred to B - Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?
A. 25%
B. 50%
C. 70%
D. 90% - Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when____________________?
A. Extracting solvent is cheaply & abundantly available
B. One of the liquid components is heat sensitive
C. Viscosity of liquid components is very high
D. One of the liquid components has very high affinity towards the solvent - Selectivity of the solvent used in solvent extraction should be)_________________?
A. 1
B. > 1
C. < 1
D. 0 - With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system) ?
A. Increases
B. Decreases
C. Remain unaffected
D. Increases Linearly - The solvent used in liquid extraction should not have high latent heat of vaporisation, because ______________________?
A. The pressure drop and hence the pumping cost will be very high
B. It cannot be recovered by distillation
C. Its recovery cost by distillation may be prohibitively high
D. It will decompose while recovering by distillation - A coalescer in a mixer-settler liquid-liquid extraction column______________________?
A. Comprises of thin bed of substances of extended surface having high porosity
B. Helps in increasing the bubble size entering the settler
C. Helps in increasing the settling rate of the bubbles
D. All ‘a’, ‘b’, & ‘c’ - In liquid-liquid extraction, the number of phases at plait point is __________________?
A. 1
B. 2
C. 3
D. 4 - Which of the following equipments is not used in liquid-liquid extraction ?
A. Pachuka tank
B. Agitated vessels
C. Centrifugal extractors
D. Packed towers - If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that___________________?
A. The system comprises of partially miscible liquids
B. The system comprises of miscible liquids
C. The system comprises of an azeotrope
D. On heating, a vapor phase will appear; while on cooling, a solid phase will appear
