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

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

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

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

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