A. 5
B. 0.5
C. 0.05
D. 50
Related Mcqs:
- Molecular sieves are regenerated by heating to ______________ °C?
A. < 150
B. 200-330
C. > 500
D. > 1000 - Molecular distillation is_____________________?
A. High temperature distillation
B. For heat-sensitive materials
C. Very low pressure distillation
D. Both B. and C. - 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 - Molecular diffusivity of a liquid__________________?
A. Increases with temperature
B. Decreases with temperature
C. May increase or decrease with temperature
D. Is independent of temperature - According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?
A. D
B. D2
C. D0.5
D. 1/D - Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular diffusion, if____________________?
A. Mass transfer is accompanied by reaction
B. Diffusion of A is in stagnant medium B
C. Molecular mean free path is high
D. There is equimolar counter diffusion - JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by___________________?
A. Nsh = 2
B. Nst = 2
C. Nsc = 2
D. None of these - Molecular sieves are porous____________________?
A. Alumina
B. Silica
C. Synthetic zeolites crystals/metal alumino-silicates
D. None of these - Molecular diffusion is caused by the________________?
A. Transfer of molecules from low concentration to high concentration region
B. Thermal energy of the molecules
C. Activation energy of the molecules
D. Potential energy of the molecules - Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve) ____________________?
A. S2/S1
B. S1/S2
C. S1 – S2
D. S1 × S2
