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11.

The partial pressure distribution of both components of a non-reacting binary mixture of ideal gases is linear

A.	in the case of steady-state equimolal counter-diffusion	B.	in the case of steady-state unimolal unidirectional diffusion
C.	both in the case of steady-state equimolal counter-diffusion and steady-state unimolal unidirectional diffusion

12.

The partial pressure distribution of both components of a non-reacting binary mixture of ideal gases is non-linear

A.	in the case of steady-state equimolal counter-diffusion	B.	in the case of steady-state unimolal unidirectional diffusion
C.	both in the case of steady-state equimolal counter-diffusion and steady-state unimolal unidirectional diffusion

13.

The diffusivity DAB for A diffusing in B is the same as the fiffusivity DBA for B diffusing in A for a binary mixture of

A.	ideal gases only	B.	real gases only
C.	both ideal and real gases	D.	real liquids only

14.

At steady-state the partial pressure distribution of an ideal gas A diffusing through a stagnant ideal gas B follows

A.	linear law	B.	hyperbolic law
C.	parabolic law	D.	exponential law

15.

Select the wrong statement

A.	Molecular diffusion in solids is much faster than molecular diffusion in gases and liquids	B.	Molecular diffusion in solids is much slower than molecular diffusion in gases and liquids
C.	The diffusion coefficient in a liquid is 10-4 to 10-5 times times the diffusion coefficient in a gas	D.	Molecular diffusion in gases is much faster than molecular diffusion in liquids

16.

The Knudsen diffusivity is proportional to where T = absolute temperature

A.	T	B.	T 3/2
C.	T 1/2	D.	T2

17.

For flow of gas through a capillary according to Poiseuilles law the permeability

A.	varies inversely as the gas viscosity	B.	is proportional to the gas viscosity
C.	varies as the square root of gas viscosity	D.	varies as the square of the gas viscosity

18.

For flow of a gas through a given capillary according to Poiseuilles law the permeability

A.	remains unaffected with change in temperature	B.	increases with increase in temperature
C.	decreases with increase in temperature	D.	varies as the square root of temperature

19.

The permeability increases with increase in temperature for the flow of gases through a capillary according to

A.	Knudsen law	B.	Poiseuilles law
C.	both Knudsen law and Poiseuilles law	D.	none of the above

20.

The binary diffusivity in liquids varies almost as

A.	T	B.	T 3/2
C.	T 2	D.	T3