Molecular Diffusion MCQ

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• The diffusion of gas is ____________
  ক

  Linear process

  খ

  Slow process

  গ

  Spontaneous process

  ঘ

  Non- spontaneous process
• What is the unit of diffusion flux “J” in the Fick’s law equation?
  ক

  mol m−2 s−1

  খ

  mol m2 s−1

  গ

  mol m2 s1

  ঘ

  mol m−2 s1
• 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:
  ক

  2.898×10-5 m2/sec

  খ

  3.898×10-5 m2/sec

  গ

  2.989×10-5 m2/sec

  ঘ

  3.989×10-5 m2/sec
• Refer to Q6, and calculate the partial pressure at a point 0.02 m apart from point 1.
  ক

  20.63 kPa

  খ

  28.33 kPa

  গ

  28.63 kPa

  ঘ

  20.33 kPa
• Refer to Q4, and calculate the diffusivity of O2 in a gas mixture.
  ক

  1.539×10-5 m2/sec

  খ

  1.639×10-5 m2/sec

  গ

  1.530×10-5 m2/sec

  ঘ

  1.630×10-5 m2/sec
• Determine the diffusivity of CO2 in a gas mixture having the composition: CO2: 28.5 %, O2: 15%, N2: 56.5%, The gas mixture is at 273 k and 1.2 * 105 Pa. The binary diffusivity values are given as: (at 273 K) D12 P = 1.874 m2 Pa/sec D13 P = 1.945 m2 Pa/sec D23 P = 1.834 m2 Pa/sec
  ক

  1.51×10-5 m2/sec

  খ

  1.50×10-5 m2/sec

  গ

  1.61×10-5 m2/sec

  ঘ

  1.60×10-5 m2/sec
• What is Fick’s law applicable to?
  ক

  Momentum transfer

  খ

  Heat transfer

  গ

  Mass transfer

  ঘ

  Velocity transfer
• Molecular diffusion is which type of motion?
  ক

  Thermal motion

  খ

  Linear motion

  গ

  Non- turbulent motion

  ঘ

  Rectilinear motion