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

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

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Chemical Reaction Engineering
Pick out the wrong statement pertaining to space velocity of flow reactors.

The unit of space velocity is (time)⁻¹
The space velocity of 3 hr⁻¹ means that one third reactor volume of feed at specified conditions are being fed into the reactor
The space velocity of 3 hr⁻¹ means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour
None of these

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Chemical Reaction Engineering
In an ideal P.F.R. at steady state conditions

There is no lateral mixing of fluid
The composition of reactants remains constant along a flow path
There may be diffusion along the flow path
The conversion of the reactant varies from point to point along a flow path

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