Related Questions

Except for monoatomic gases, the molal heat capacity at constant volume for all gases is __________ Kcal/Kg mole.° K.
A 3
B > 3
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 $$\sqrt {\text{T}} $$
Unit of molal diffusivity is
A cm2/sec gm.mole
B gm moles/cm2.sec
C gm moles/cm.sec
D gm moles/cm3.sec
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 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
At higher temperature, molal heat capacities of most of the gases (at constant pressure) __________ with increase in temperature.
A Increases
B Decreases
C Remains unchanged
D Increases linearly
At higher temperatures, molal heat capacities for most of the gases (at constant pressure) __________ with increase in temperature.
A Varies linearly
B Increases
C Decreases
D Does not vary
In case of gases, the binary diffusivity is proportional to (where, P = pressure)
A P
B $$\frac{1}{{\text{P}}}$$
C $$\frac{1}{{\sqrt {\text{P}} }}$$
D $$\sqrt {\text{P}} $$

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