Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when____________________?

Related Mcqs:

1. 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

2. 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%

3. The solvent used in liquid-liquid extraction should have _______________ less than one?

   A. Selectivity
   B. Distribution co-efficient
   C. Both A. and B.
   D. Neither A. nor B.

4. Selectivity of the solvent used in solvent extraction should be)_________________?

   A. 1
   B. > 1
   C. < 1
   D. 0

5. 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

6. With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system) ?

   A. Increases
   B. Decreases
   C. Remain unaffected
   D. Increases Linearly

7. 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

8. Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their____________________?

   A. Viscosity
   B. Density
   C. Solubility
   D. Relative volatility

9. Separation of two or more components of a liquid solution cannot be achieved by___________________?

   A. Fractional crystallisation
   B. Liquid extraction
   C. Absorption
   D. Evaporation

10. In liquid-liquid extraction, the number of phases at plait point is __________________?

    A. 1
    B. 2
    C. 3
    D. 4