Chemical Reaction Engineering
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

Temperature should be high in the beginning and decreased towards the end of the reaction
Very low temperature should be used throughout the reaction
None of these
Very high temperature should be used throughout the reaction

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

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

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