Diffusion in Solids,Liquids and Gases MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Diffusion in Solids,Liquids and Gases, a fundamental topic in the field of Mass Transfer. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Diffusion in Solids,Liquids and Gases MCQs are designed to help you grasp the core concepts and excel in solving problems.

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Diffusion in Solids,Liquids and Gases MCQs | Page 6 of 8

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Q51.
Two large vessels containing gaseous mixture of A and B at different concentrations but at the same total pressure are connected by a tapered tube of length 15cm and end diameters 1cm and 4 cm. what should be the diameter of a cylindrical tube of the same length that allows the same rate of transport of A?

a.

2.5 cm

b.

2 cm

c.

3cm

d.

3.5 cm

Discuss
Answer: (b).2 cm
Q52.
Two large vessels containing gaseous mixture of A and B at different concentrations but at the same total pressure are connected by a tapered tube of length 15cm and end diameters 1cm and 4 cm. At which point of the following locations in the tapered tube, the magnitude of the flux maximum?

a.

At the larger diameter end

b.

At the smaller diameter end

c.

Midway in the tube

d.

Somewhere in between the midway and the larger diameter end

Discuss
Answer: (b).At the smaller diameter end
Q53.
Equimolar counterdiffusion of A and B occurs through a spherical film of i.d=rᵢ and thickness δ. The flux of A is Nᴀ₁ at r=rᵢ. The flux through a flat film of the same thickness is Nᴀ₂. if Nᴀ₁ is larger than Nᴀ₂ by 5%, the film thickness δ is

a.

0.025rᵢ

b.

0.05rᵢ

c.

0.1rᵢ

d.

0.01rᵢ

Discuss
Answer: (b).0.05rᵢ
Q54.
A napthelene hemisphere is placed on a glass plate and a napthelene ball of identical diameter is kept suspended in the stagnant air in two large rooms. The respective shapes of the ball are maintained while they sublime and reduce in size. Which of the following statements are true in this connection?

a.

They take the same time for complete sublimation

b.

The sphere disappears first

c.

The hemisphere disappears first

d.

Nothing definite can be said

Discuss
Answer: (a).They take the same time for complete sublimation
Q55.
Sublimation of a long cylinder made of napthelene occurs in a large volume of stagnant air. The time required for its complete sublimation is

a.

infinite

b.

half the time of sublimation of a sphere of the same mass

c.

twice the time of sublimation of a cylinder of the same mass and lengthy/diameter=1

d.

half the time of sublimation of a cylinder of the same mass and lengthy/diameter=1

Discuss
Answer: (a).infinite
Q56.
In a binary gas mixture containing A and B, If Nᴀ=-2Nв, what will be the expression for Nᴀ?

a.

2(D*(P₁-P₂))/RTL

b.

(D*(P₁-P₂))/RTL

c.

DP*(2RTZ)⁻¹*ln[(P-P₁)/(P-P₂)].

d.

2DP*(RTZ)⁻¹*ln⁡[(P-P₁)/(P-P₂)].

Discuss
Answer: (a).2(D*(P₁-P₂))/RTL
Q57.
Oxygen diffuses through a stagnant layer of air, 1mm thick, ambient temperature 28°C and 1atm total pressure. The partial pressure of oxygen on two sides of layer is P₁=0.9atm and P₂=0.1atm respectively. Calculate the value of Molar flux (in mol/m².s) with respect to an observer moving with molar average velocity. Calculate this value at the end of the path where P₂=0.1atm. Use R=8.205*10⁻⁵m³atmK⁻¹mol⁻¹.

a.

2.713

b.

1.713

c.

0.1713

d.

0.01713

Discuss
Answer: (b).1.713
Q58.
In order to prepare Lithium nitride, air is passed gently over a reactor. Suppose that Nitrogen diffuse to a length 5cm before getting reacted with Lithium. Nitrogen reacts with lithium quickly so that partial pressure of Nitrogen at that point is 0. Reactor is a cylinder of length 10cm and diameter 2cm. Assume air to be a mixture of Nitrogen and Oxygen only. The temperature is 298K and total pressure 1atm. Diffusivity of N₂ in O₂ is 2*10⁻⁵m²/s. Calculate the Molar flux (mol/m².s) of N₂ at a distance of 2.5cm from the top with respect to an observer moving with twice the mass average velocity a direction towards the liquid surface. (R=8.205*10⁻⁵m³atmK⁻¹mol⁻¹). Assume z=0 at the top of the reactor.

a.

4.242*10⁻⁴

b.

4.242*10⁻⁵

c.

4.242*10⁻³

d.

4.242*10⁻²

Discuss
Answer: (a).4.242*10⁻⁴
Q59.
A binary liquid mixture is separated by distillation process. The more volatile A vaporizes while less volatile B gets transported in opposite direction. Latent heat of vaporization of A and B is 0.5 unit and 1 unit respectively. What will be the relation between molar flux of A and B?

a.

Nᴀ=2Nв

b.

2Nᴀ=Nв

c.

Nᴀ=4Nв

d.

4Nᴀ=Nв

Discuss
Answer: (a).Nᴀ=2Nв
Q60.
In an accident a container containing ethanol(s.g 0.789) falls down in a room of dimension 1*1*2(all in m). Ethanol forms a layer of 2mm. Ethanol vaporizes and diffuses through a stagnant film of air of thickness 2.5mm. What will be the time required for the water layer to disappear completely. The diffusivity of ethanol in air is 2.567*10⁻⁵ m²/s. The total pressure is 1.013 bar and the pressure of ethanol in bulk air is 0.02244 bar and at the ethanol-air interface is 0.02718bar. The temperature is 25.2°C.

a.

4.73h

b.

14.6h

c.

5.87h

d.

16.2h

Discuss
Answer: (a).4.73h
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