_______________ diffusion is used for separating the isotopes of methane ?

Related Mcqs:

1. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?

   A. Cost
   B. Availability
   C. Toxicity
   D. Selectivity

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. Ordinary diffusion process is also called ______________ diffusion?

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

4. 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

5. ___________________ extractor uses centrifugal force for separating the two phases?

   A. Treybal
   B. Scheibel
   C. Podbielniak
   D. None of these

6. Flash distillation is suitable for separating the constituents of a binary system, which _____________________?

   A. Form minimum boiling azeotrope
   B. Have very wide boiling points
   C. Have very close boiling points
   D. Form constant boiling azeotrope

7. Separation of the isotopes of helium for scientific investigations is done by_____________________?

   A. Reverse osmosis
   B. Thermal diffusion
   C. Leaching
   D. Solvent extraction

8. 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

9. 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

10. 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