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

Related Mcqs:

1. 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

2. Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?

   A. 5.6 × 10-4
   B. 8.5 × 10-4
   C. 5.6 × 10-3
   D. 8.5 × 10-3

3. _____________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation?

   A. Furfural
   B. Benzol
   C. Butyl acetate
   D. Hexane

4. 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

5. 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

6. Ordinary diffusion process is also called ______________ diffusion?

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

7. A distillation column separates 10000 kg/hr of a benzene-toluene mixture as shown in the figure below: In the figure xF, xD and xW represent the weight fraction of benzene in the feed, distillate and residue respectively. The reflux ratio is_______________ ?

   A. 0.5
   B. 0.6
   C. 1.0
   D. 2.0

8. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?

   A. 100
   B. 10
   C. 5
   D. 1

9. 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

10. Gaseous diffusion co-efficient increases with increase in the_____________________?

    A. Pressure
    B. Temperature
    C. Both A. & B.
    D. Neither A. nor B.