In case of liquids, the binary diffusivity is proportional to (where, T = temperature) _____________________?

Related Mcqs:

1. 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

2. In case of gases, the binary diffusivity is proportional to (where, P = pressure) ?

   A. P
   B. 1/P
   C. 1/√P
   D. √P

3. The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = _________________?

   A. 1
   B. 0.5
   C. 10
   D. 0

4. The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of________________?

   A. Newtonian liquids
   B. Non-Newtonian liquids
   C. Ideal gases
   D. Real gases

5. The binary diffusivity in gases and liquids vary respectively as_________________?

   A. T3/2 and T
   B. T and T3/2
   C. √T and T3/2
   D. T3/2 and √T

6. In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the__________________?

   A. Temperature and pressure
   B. Concentration
   C. Nature of the constituents
   D. None of these

7. In case of non-ideal gases and liquids, the molal diffusivity ________________?

   A. Varies inversely as the pressure
   B. Varies directly as the pressure
   C. Is independent of pressure
   D. Is equal to the volumetric diffusivity

8. The diffusivity D. in a binary gas mixture is related to the temperature (T) as________________________?

   A. D ∝ T
   B. D ∝ T0.5
   C. D ∝ T1.5
   D. D ∝ T2

9. The Knudsen diffusivity is proportional to (where, T = absolute temperature) ______________________?

   A. √T
   B. T2
   C. T
   D. T4

10. If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is____________________

    A. 0
    B. 1
    C. 1