In case of gases, the binary diffusivity is proportional to (where, P = pressure)

In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

A

T

B

$$\sqrt {\text{T}} $$

C

T²

D

$$\frac{1}{{\text{T}}}$$

The binary diffusivity in gases and liquids vary respectively as

A

$${{\text{T}}^{\frac{3}{2}}}$$ and T

B

T and $${{\text{T}}^{\frac{3}{2}}}$$

C

$$\sqrt {\text{T}} $$ and $${{\text{T}}^{\frac{3}{2}}}$$

D

$${{\text{T}}^{\frac{3}{2}}}$$ and $$\sqrt {\text{T}} $$

The binary diffusivity in gases does not depend upon the

A

Pressure

B

Temperature

C

Nature of the components

D

None of these

The binary diffusivity in gases at atmospheric conditions is about

A

10^-9 cm/sec

B

10^-1 cm²/sec

C

10^-3 sec/cm

D

10^-4 cm²/sec²

The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

A

Prandtl

B

Nusselt

C

Stanton

D

Grashoff

If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the

A

Pressure

B

Temperature

C

Both A & B

D

Neither A nor B

If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

A

0

B

1

C

> 1

In case of non-ideal gases and liquids, the molal diffusivity

A

Varies inversely as the pressure

B

Varies directly as the pressure

C

Is independent of pressure

D

Is equal to the volumetric diffusivity

In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the

A

Temperature and pressure

B

Concentration

C

Nature of the constituents

D

None of these

According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

A

D

B

D²

C

D^0.5

D

$$\frac{1}{{\text{D}}}$$

In case of gases, the binary diffusivity is proportional to (where, P = pressure)

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