Chemical Reaction Engineering
Semibatch reactor is preferred, when a/an

All of these
A highly exothermic reaction is to be controlled
A gas is to be reacted with liquid (e.g. hydrogenation of fat)
Undersirable side reaction (at high concentration of one of the reactants) is to be avoided

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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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Chemical Reaction Engineering
Promoter.

Atlers the position of equilibrium in a reversible reaction
Initiates a chemical reaction and is a catalyst by itself
Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals
All of these

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