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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
Correct Answer:
True
For equimolar counter diffusion, the one component flux is negative of other.
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
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
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
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
For the molecular diffusion of liquids, if the diffusing molecules having criteria of steady state diffusion of B over non diffusing A then the N flux of A is
A
1
B
0
C
Negative
D
Infinity
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
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
In a diatomic molecule, the inter-nuclear separation of the ground and first excited electronic state are the same as shown in the figure. If the molecule is initially in the lowest vibrational state of the ground state, then the absorption spectrum will appear as
A
<img src="/images/option-image/engineering-physics/atomic-and-molecular-physics/1689658302-35-1.png" title="Atomic and Molecular Physics mcq question image" alt="Atomic and Molecular Physics mcq question image">
B
<img src="/images/option-image/engineering-physics/atomic-and-molecular-physics/1689658313-35-2.png" title="Atomic and Molecular Physics mcq question image" alt="Atomic and Molecular Physics mcq question image">
C
<img src="/images/option-image/engineering-physics/atomic-and-molecular-physics/1689658327-35-3.png" title="Atomic and Molecular Physics mcq question image" alt="Atomic and Molecular Physics mcq question image">
D
<img src="/images/option-image/engineering-physics/atomic-and-molecular-physics/1689658340-35-4.png" title="Atomic and Molecular Physics mcq question image" alt="Atomic and Molecular Physics mcq question image">
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