Chemical Reaction Engineering
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

Both A & B
Temperature
Neither A nor B
Pressure

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Chemical Reaction Engineering
Mean residence time is equal to the space time, when

There is no change in number of moles in gaseous reaction
The feed rate is measured at temperature and pressure in the reactor
All of these
The temperature, pressure and the density of reaction mixture remains constant throughout the reactor

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