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Chemical Engineering Exam  >  Chemical Engineering Tests  >  Test: Molecular Diffusion In Solids - Chemical Engineering MCQ

Test: Molecular Diffusion In Solids - Chemical Engineering MCQ


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10 Questions MCQ Test - Test: Molecular Diffusion In Solids

Test: Molecular Diffusion In Solids for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Test: Molecular Diffusion In Solids questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Molecular Diffusion In Solids MCQs are made for Chemical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Molecular Diffusion In Solids below.
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Test: Molecular Diffusion In Solids - Question 1
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Find the operation where diffusion of solids not occurs

Detailed Solution for Test: Molecular Diffusion In Solids - Question 1

Explanation: Distillation is the liquid-liquid operation where no diffusion on solid is possible.

Test: Molecular Diffusion In Solids - Question 2
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Find the diffusivity through slab if N flux of A 4 mol/sq.m sec, concentration difference is 2mol/cu.m and distance is 3 m.

Detailed Solution for Test: Molecular Diffusion In Solids - Question 2

Explanation: N flux of A= D(AB)/z * concentration difference
D(AB) = 6 sq.m/sec.

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Test: Molecular Diffusion In Solids - Question 3
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Find the activated diffusivity of carbon if energy of activation is 6 kJ; the value of constant diffusivity is 2.5 sq.m/sec. (Hint: the value of exponential of (-6/RT) is 2.55)

Detailed Solution for Test: Molecular Diffusion In Solids - Question 3

Explanation: Activated diffusivity= constant diffusivity * exponential value
= 2.5 * 2.55
= 6.375.

Test: Molecular Diffusion In Solids - Question 4
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 The term activated means _____________
Detailed Solution for Test: Molecular Diffusion In Solids - Question 4

Explanation: Activated represents the activation energy which depends on temperature.

Test: Molecular Diffusion In Solids - Question 5
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If the two gases are separated by a polymer membrane, the extent of diffusion depends on _______ law.
Detailed Solution for Test: Molecular Diffusion In Solids - Question 5

Explanation: Concentration is directly proportional to pressure so Hendry law is applicable.

Test: Molecular Diffusion In Solids - Question 6
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For permanent gases diffusivity the order is _________ sq.m/s 
Detailed Solution for Test: Molecular Diffusion In Solids - Question 6

Explanation: The gas can become permeable to certain substance if it is in an order of 10-10.

Test: Molecular Diffusion In Solids - Question 7
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The solute movement of fluid on solids are __________
Detailed Solution for Test: Molecular Diffusion In Solids - Question 7

Explanation: Solute movement is due to pressure difference which is hydrodynamic.

Test: Molecular Diffusion In Solids - Question 8
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If the pore of the solid is inaccessible to external fluids then it is known as dead end.
Detailed Solution for Test: Molecular Diffusion In Solids - Question 8

Explanation: If the pore of the solid is inaccessible to external fluids then it is known as isolate.

Test: Molecular Diffusion In Solids - Question 9
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Macroporic surrounding of microscopic pellets powders of different magnitude in size is _______
Detailed Solution for Test: Molecular Diffusion In Solids - Question 9

Explanation: The double surrounding of these pellets is known as bi-disperse.

Test: Molecular Diffusion In Solids - Question 10
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Find the permeability if diffusivity is 2 units and solubility coefficient is 5 units assume all are in SI units.
Detailed Solution for Test: Molecular Diffusion In Solids - Question 10

Explanation: Permeability = solubility co-efficient * diffusivity
= 2 * 5 =10 units.

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