Ordinary diffusion process is also called ______________ diffusion?

Related Mcqs:

1. 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

2. The rough value of diffusion co-efficient of water vapor into air at 25°C may be about ______________ cm2/sec?

   A. 0.25
   B. 2.5
   C. 1.25
   D. 0.0025

3. The drying time between fixed moisture content within diffusion controlled ‘falling rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?

   A. √T
   B. T
   C. T2
   D. T3

4. Steady state equimolal counter diffusion is encountered in_____________________?

   A. Separation of a binary mixture by distillation
   B. Absorption of NH3 from air by water
   C. All liquid-liquid diffusion systems
   D. All liquid-solid diffusion systems

5. The value of NA/(NA + NB) for steady state molecular diffusion of gas ‘A’ through nondiffusing gas ‘B’ is____________________?

   A. 1
   B. ∞
   C. 0.5
   D. 2

6. Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the_________________?

   A. Mass transfer co-efficient
   B. Thermal diffusivity
   C. Kinematic viscosity
   D. Volumetric diffusivity

7. The diffusion co-efficient in m2/s. of acetic acid in benzene (liquid in liquid) is___________________?

   A. 2.09 × 10-4
   B. 2.09 × 10-5
   C. 2.09 × 10-9
   D. 2.09 × 10-12

8. Steady state equimolal counter diffusion occurs in case of ____________________?

   A. Leaching
   B. Absorption
   C. Binary phase distillation
   D. Liquid-liquid extraction

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

   A. Degree of ideality
   B. Viscosity
   C. Both A & B
   D. Neither A nor B

10. 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