Diffusion in concentrated solutions differs from that in dilute solutions, because of the change in the _______________ with the concentration of the solution?

Related Mcqs:

1. Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?

   A. Viscosity with concentration
   B. Degree of ideality of the solution
   C. Both A. and B.
   D. Neither A. nor B.

2. The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?

   A. Kc = Kp = Km
   B. Kc = Kp/RT = Km . RT/P
   C. Kc = Kp . RT = Km . RT/p
   D. None of these

3. Water-ethyl alcohol solution can be concentrated (in respect of alcohol concentration) by ________________ distillation?

   A. Atmospheric
   B. Vacuum
   C. High pressure
   D. None of these

4. Ordinary diffusion process is also called ______________ diffusion?

   A. Pressure
   B. Thermal
   C. Concentration
   D. Forced

5. Acetic acid will be most economically separated from a dilute solution of acetic acid in water by____________________?

   A. Solvent extraction
   B. Continuous distillation
   C. Evaporation
   D. Absorption

6. The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by___________________?

   A. Increasing the gas film co-efficient
   B. Increasing the liquid film co-efficient
   C. Increasing the total pressure
   D. Decreasing the total pressure

7. _______________ diffusion is used for separating the isotopes of methane ?

   A. Thermal
   B. Pressure
   C. Concentration
   D. Force

8. 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%

9. 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

10. Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when_________________?

    A. Only vapor phase follows Raoult’s law
    B. Only liquid phase obeys Dalton’s law
    C. Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law
    D. Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law