Chemical Reaction Engineering
The energy balance equation over a tubular reactor under transient conditions is

An ordinary non-linear differential equation
A linear partial differential equation
A non-linear partial differential equation
An algebric differential equation

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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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