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The value of a ratio of N flux of A to the total N flux for a steady state equimolar counter diffusion is
A
0
B
Infinity
C
1
D
None of the mentioned
Correct Answer:
Infinity
As the total flux becomes zero, the value of the ratio becomes infinity.
In a gas mixture of hydrogen and oxygen, steady state equimolar counter diffusion is occurring at a total pressure of 100 kPa and temperature of 20°C. If the partial pressures of oxygen at two planes 0.01 m apart, and perpendicular to the direction of diffusion are 15 kPa and 5 kPa, respectively and the mass diffusion flux of oxygen in the mixture is 1.6 * 10–5 kmol/m2.sec, calculate the molecular diffusivity for the system. For equimolar counter current diffusion:
A
2.898×10-5 m2/sec
B
3.898×10-5 m2/sec
C
2.989×10-5 m2/sec
D
3.989×10-5 m2/sec
For liquid molecular diffusion of A and B, steady state equimolar counter diffusion the N flux of A is negative of N flux of B.
A
True
B
False
Find the change in concentration for a steady state equimolar counter diffusion if D(AB)= 6 sq.m/sec, the change in distance is 2 m and the N flux of A is 5 mol/sq.m sec.
A
0.67
B
1.67
C
2.67
D
None of the mentioned
For a steady state equimolar counter diffusion of A and B. The N flux of A is ________
A
– N flux of A
B
N flux of A
C
– N flux of B
D
N flux of B
What is referred as equimolar counter–diffusion, when the molecular diffusion in amino acid and water gives certain flux value?
A
Jamino acid = Jwater
B
Jamino acid = -Jwater
C
Jamino acid = Jamino acid – Jwater
D
Jamino acid = Jamino acid
Concentration of hydrogen gas across a 2mm thick palladium sheet differs by 4 kg/m3. Considering steady-state diffusion with diffusion constant 10-10 m2/s, diffusion flux is ______ kg/m2.s:
A
2 x 1010
B
2 x 10-10
C
5 x 10-11
D
5 x 109
Consider the following statements regarding the importance of diffusion and choose the correct answer:
1. The exchange of gases takes place by the principle of dependent diffusion
2. The process of diffusion is involved in transpiration of water vapours
3. The ions are absorbed by the simple diffusion during passive salt uptake
4. Diffusion is an effective means of transport of substances over a very short distance and helps in the translocation of food materials
A
1, 3 and 4 are true
B
1 and 4 are true
C
1, 2 and 3 are true
D
2, 3 and 4 are true
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, K
c
& K
m
are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, K
p
= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)
A
K<sub>c</sub> = K<sub>p</sub> = K<sub>m</sub>
B
K<sub>c</sub> = K<sub>p</sub>/RT = K<sub>m</sub> . RT/P
C
K<sub>c</sub> = K<sub>p</sub> . RT = K<sub>m</sub> . RT/p
D
None of these
If the value of N flux of A to the total N flux is 1 then it is a steady state diffusion of non-diffusing B.
A
True
B
False
Pseudo steady state is not truly steady state but for convenience is treated as steady state. The above statement for a process is
A
Correct
B
Incorrect
C
Never incorrect
D
None of the mentioned