Fick’s Law-1 MCQ

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• The dimension of diffusion coefficient is given by
  ক

  M L T -2

  খ

  L 2 T -1

  গ

  L T -1

  ঘ

  M L -2 T
• What is the molecular weight of Sulphur-dioxide?
  ক

  84

  খ

  74

  গ

  64

  ঘ

  54
• Estimate the diffusion coefficient of carbon monoxide through air in which the mole fractions of each constituents are O 2 = 0.18 N 2 = 0.72 CO = 0.10 The gas mixture is at 300 K and 2 atmosphere total pressure. The diffusivity values are D CO = 18.5 * 10 -6 m2/s at 273 K, 1 atm D CN = 19.2 * 10 -6 m2/s at 288 K, 1 atm The subscripts C is carbon monoxide, O is oxygen and N is nitrogen
  ক

  10.29 * 10 -6 m2/s

  খ

  18.5 * 10 -6 m2/s

  গ

  17.5 * 10 -6 m2/s

  ঘ

  13.5 * 10 -6 m2/s
• Estimate the diffusion coefficient for ammonia in air t 25 degree Celsius temperature and one atmospheric pressure. For ammonia, Molecular weight = 17 Molecular volume = 25.81 cm3/gm mole For air, Molecular weight = 29
  ক

  0.4880 cm2/s

  খ

  0.3880 cm2/s

  গ

  0.2880 cm2/s

  ঘ

  0.1880 cm2/s
• What is the value of Schmidt number for hydrogen?
  ক

  0.23

  খ

  0.22

  গ

  0.21

  ঘ

  0.21
• What is the molecular volume of air at normal boiling point?
  ক

  29.89 cm3/gm mole

  খ

  39.89 cm3/gm mole

  গ

  49.89 cm3/gm mole

  ঘ

  59.89 cm3/gm mole
• What is the molecular weight of ammonia?
  ক

  31

  খ

  53

  গ

  29

  ঘ

  39
• What is the unit of diffusion coefficient?
  ক

  m2

  খ

  s

  গ

  m2 s

  ঘ

  m2/s
• Figure shows equimolal diffusion between species B and C. Identify the correct molar diffusion rate
  ক

  N b = m c/M b

  খ

  N b = m b/M b

  গ

  N c = m b/M b

  ঘ

  N c = m b/M c
• Fick’s law is given by the formula
  ক

  N b = – D b c d C b/d x

  খ

  N b = – 2 D b c d C b/d x

  গ

  N b = – 3 D b c d C b/d x

  ঘ

  N b = – 4 D b c d C b/d x