Chemical Reaction Engineering
The space time is equivalent to the holding time in a steady state mixed reactor for

Variable fluid density systems
Constant fluid density systems
Gas reactions with changing no. of moles
Non-isothermal gas reaction

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

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
All of these
A highly exothermic reaction is to be controlled

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Chemical Reaction Engineering
In the reversible reaction of the type, A + B ⇋ AB, in general

Both forward and backward reactions will be exothermic
Neither of the reactions will be en-dothermic
The combination reaction will be exothermic, while the dissociation reaction will be endothermic
The combination reaction will be endothermic, while the dissociation reaction will be exothermic

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