Chemical Reaction Engineering
Which of the following is not a unit of reaction rate?

Moles for med/(surface of catalyst) (time)
Mole formed/volume of catalyst) (time)
None of these
Moles formed/volume of reactor) (time)

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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
The feed rate is measured at temperature and pressure in the reactor
All of these

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

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

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