Chemical Reaction Engineering
Organic catalysts differ from the inorganic catalyst in the sense that the former is

Active at very high temperature only
Active at cryogenic temperatures only
Prohibitively costly
Proteinous in nature

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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
There is no change in number of moles in gaseous reaction
All of these
The feed rate is measured at temperature and pressure in the reactor

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